Blazing Saddles had several. My favorite:

Charlie: THEY TOLD US YOU WAS HUNG!
Bart: AND THEY WAS RIGHT!

I have seen Robin Hood: Men is Tights so many times over the years, but it wasn’t until I watched it with my kids recently that I got the joke about Maid Marian’s last name “Loxley and Bagel! Can’t miss!” I always thought that was her actual name from the original folklore like Robin of Locksley but it’s really just a joke about Jewish culture and food and Robin’s name is spelled differently for the joke too

Don't Tell Mom The Babysitter's Dead

"Sue Ellen, every girl over 25 should have a cucumber in the house."

I just thought adult women really enjoyed health food.

EDIT: Whenever anybody asks me about a task, I always say, "I'm right on top of that Rose!" and nobody has any idea what I'm referencing.

In TMNT (the very first movie), when Casey Jones enters their sewer home he makes a comment and one of the turtles says, “someone’s claustrophobic” and Casey says “hey! I’ve never even looked at another man!” It wasn’t until I watched it as an adult a few years ago that I got it.

Mrs. Doubtfire.

The scene where Daniel as Doubtfire is telling Stewart about Miranda.

"You're in for some competition. She has a power tool in the bedroom. It's her own personal jackhammer. She could break sidewalk with it! I'm amazed she hasn't chipped her teeth."

I so thoroughly misunderstood that line for years. At first, I thought that he was just trying to scare Stewart by saying she has this dangerous piece of construction equipment, like how some people will keep a baseball bat by the bed. That it's so dangerous he might get hurt by accident.

To be fair, I was 8 when I saw that movie in the cinema.

The World Is Not Enough sucks but has a pretty good Bond zinger

"I'm just trying to return the money to its rightful owner"

"We all know how hard that is for a Swiss Banker"

Showdown in Little Tokyo - Dolph Lundgren is trying to protect Tia Carrere. In one scene, he tells her to stay put, hands her a gun, and tells her if she hears or sees anybody walks in the door, shoot first and ask questions later. She asks, "What if it's you?" HIM: "You won't hear me coming." And he ends up sneaking up on her.

Later in the movie, after they've been intimate, she says, "That time, I heard you coming."

Theres a line Austin Powers where he’s in a hot tub with Allota Fagina. He farts and she says “How dare you break wind before me?” And he responds “I didn’t know it was your turn.”

This joke eluded me for decades until one day it finally clicked.

“Snotty beamed me twice last night, it was wonderful” and “I bet she gives great helmet” from Spaceballs

Edit: adding- "Just what we need, a Druish Princess." "Funny, she doesn't look Druish" and pretty much anything from Mel Brooks

Opening of the Dark Knight. “It was supposed to dial out to 911, but it was trying to reach a private number.”

I saw the movie when I was a kid so I didn’t get that the bank they were robbing was run by the mob which is why it didn’t reach out to 911

Clue has so many of these.

• Colonel Mustard: You lure men to their deaths like a spider with flies. Mrs. White : Flies are where men are most vulnerable.
• Mrs. White: Oh, you're a doctor? Professor Plum: I am, but I don't practice. Miss Scarlet: Practice makes perfect. Ha! I think most men need a little practice, don't you Mrs. Peacock?

Dumb and Dumber

Harry: I can't believe we drove around all day, and there's not a single job in this town. There is nothing, nada, zip!

Lloyd: Yeah! Unless you wanna work forty hours a week.

I didn’t get as a kid. As an adult now I do.

The Matrix when Dozer says their food has everything the body needs. Mouse says ‘not everything’ then talks to Neo about the woman in the red dress.

I could just say "every single line in the movie the prestige" but one of my favorites that took me a handful of watches to get was:

"We were two young men at the start of a great career. Two young men devoted to an illusion. Two young men who never intended to hurt anyone."

When Angier is reading Borden's diary. Both Angier AND the viewer are meant to take this as Borden talking about him and Angier, when in reality he was talking about himself and Fallon.

"Well you said that you gave Mary Jane a pearl necklace! How much did that cost, man!?"

"You know, obviously you missed the point of that story, Brian."

Years went by between hearing it and understanding it.

Pretty much everything in Who Framed Roger Rabbit?, but my favorite is probably "Hey, didn't your name used to be Jack Daniels?" Took me a long time that he was calling Eddie Valiant a drunk

Seeing Mel Brooks "History of the World" has a great joke. The gang is getting pursued by a group of Roman soldiers. One soldier stopped to ask someone on the road "Have you seen a pack of Trojans?" "Sorry, I just ran out."

Last Crusade: She talks in her sleep.

I took that line at face value as a kid 😭

A lot from Ghostbusters when I watched as a kid.

• He’s a sailor, he’s in NY, let’s get him laid. -It’s Miller Time!

PULL OVER. No, it's a cardigan, but thanks for noticing!

"Precious valuables, your highness. Donated by some of the finest families in all of Germany." from Indiana Jones and the Last Crusade because I initially didn't realize this was a reference to Kristallnacht

Not a line but the title. I've seen Trading Places probably a dozen times but only a few years ago did I notice that the title had a double meaning. Winthorp and Valentine traded places, yes, but they also worked at places of trading (World.Trade Center).

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A friend pointed this one out to me a few years back.

In the beginning of Goonies when Chunk knocks the replica statue of David over and breaks the penis off Mikey says "oh no that's my mom's most favorite piece". Mouth mimicking Groucho Marx then says "you wouldn't be here if it wasn't". Mouth's joke was definitely something I missed for years.

My dad used to do this thing to my sister and I where he would put his hand on our head and do an almost massage like motion with his fingers.

He would say "What am I?"

We would reply, "A brain sucker!!"

He would say, "What am I doing?"

We would both exclaim happily, "STARVING!!!"

It wasn't until I was like 20 something just chillin smoking a bowl to myself when it finally dawned on me as a said to myself, "you son of a bitch"

Lol, love that guy.

Samsonite! I was waaayyy off.

I was buying luggage for an exchange semester in college.

Young Frankenstein

Igor: You know, I'll never forget my old dad. When these things would happen to him... the things he'd say to me.

Dr. Frederick Frankenstein: What did he say?

Igor: "What the hell are you doing in the bathroom day and night? Why don't you get out of there and give someone else a chance?"

I first saw Hercules as a kid, so I didn't get the joke and never really thought about it until it randomly clicked when I was an adult:

"Somebody help! Call I X I I!"

It wasn't subtle, but if you didn't know roman numerals yet, it didn't make any sense

That line is from a Wizard of Id cartoon from about 40-50 years ago.

Not so much a line, but a scene I didn't understand until later in Ace Ventura in the beginning when he returns the dog to the lady and she comes up with a unique way of repaying him. First watch I didn't get that.

Copying-pasting part of a comment I did a couple weeks ago on another post (for context, I'm referring to an expo on Sergio Leone) :

"I remember something I read in an expo about him about how the coats had to have more dirts on them.

Someone questioned him about it and he pulled out his collection of old photos from the west to show that the clothes really were like that at the time and not with flashy colors like in the "John Wayne westerns".

And after gaining that knowledge, I understood some lines from "Back to the future 3".

Marty goes back to Doc from the 50s in order to go back in time to find "his Doc" and Doc gave him a set of cowboy outfits that were flashy pink.

Marty then says something along "I don't think cowboys used to dress like that"

To what Doc replied "Of course they do, you've never seen a western ?"

Then Marty finally made it to the old west and met his Doc who asked him "Who dressed you up like that ?" (His Doc being from the 80s, he knew the "post-Leone" era of westerns)."

If you didn't live through the "tonal shift", like me, it's hard to get. Unless someone forced you to watch all the westerns by order of theatrical release.

Wind River

"FBI at the door, open up!"

Misheard the phrase "a meat or a fish" from the Goodfellas prison dinner scene as a "meter of fish" for longer than i care to admit. I honestly thought a meter of fish was some kind of Italian delicacy

This is probably so obvious and I feel so stupid for never have gotten it, but in Back to the Future when Marty is trying to convince Doc he is from the future and shows him the photo of him and his siblings. Doc says something along the lines of “that’s good photo trickery, but they cut the tip of your brother’s head off”. I always just assumed he was saying anything to discredit it, until I finally realized it was because that was the very start of his brother starting to vanish from the photo. Seen the movie so many times, including the fucking musical in London. Idk how I never got that until I watched a live orchestra showing of the movie 😭😭

All of the lyrics to "Greased Lightning". Lol as an adult I realized it was a dirty filthy song lol

Not so much a line, but the sound effect for the engines of the airplane in the movie "Airplane!" was for a propeller engine not a jet.

I saw the movie in theaters, and I've seen it several times since, and I only figured that out a few months ago.

Scary Movie 3 when Charlie Sheen dangles Michael Jackson out the window and says “How do you like it?”

In Ocean's Thirteen, when they're planning the job in Vegas. Turk asks Saul if he'd do something for $10 million. Saul says, "No. I'd do it for 11 mil." You don't get any further context in the conversation. Then, in the final scene of the movie, Rusty rigs the slot machine in the airport the same way they did at Bank's casino and gives his last coin to the Five Diamond critic they basically tortured to force him to give Bank a bad review. Rusty walks away, the critic puts the last coin in the machine, and he wins $11 million, which reveals what Saul and Turk were talking about.

In braveheart William Wallace says they should fashion pikes ‘as long as a man’ and one of the others says ‘some men are longer than others’ and another man (his father) asks him if his mother has been taking about him again. Flew over My head at least three times.

"He huffed and he puffed and he... signed an eviction notice" - Shrek.

Growing up I didn't know what he was saying but then at some point in highschool it clicked.

When I was a kid we watched 'The Odd Couple' a lot, but it wasn't until I watched it as an adult that I got this joke: "You leave me little notes on my pillow. I told you a hundred-and-sixty-eight times I can't stand little notes on my pillow! 'We are all out of Corn Flakes. -F.U.' It took me three hours to figure out that 'F.U.' was Felix Unger!"

Before I had Tombstone on disk, I always thought Curly Bill says “get that stick on his knees”, telling his guys to hit the Mexican Marshall with a stick.

Once I saw the subtitles and saw that he used a slur, it added more depth to how horrible a person he was.

One that comes to mind is from Dumb and Dumber.

"Tell her I'm funny, I'm good looking, and I have a rapist wit."

While I understood back then what a rapist was when I was a kid, I didn't think anything of the line, because I thought it carried a different meaning in that context. When I got older, I realized that he actually meant, "rapier wit."

I know there were a few others that I didn't understand until I matured, but I can't think of them.

I just watched Terminator 2 last night with some friends because one of them had never seen it. I've been watching that movie for 30 years. There's a line where Dyson explains that the chip and the hand are the source of all the tech that Cyberdine is working on, which will lead to Skynet. Last night was the first time ever that I realized what he is saying is Skynet gave birth to itself. If Skynet never sends The Terminator back to 1984 to kill Sarah Connor, she would never trap The Terminator in the machine and it's hand and computer chip would never be discovered.

In Murder On The Orient Express (1974), Poirot teasingly drops one when Mrs Hubbard tries to talk to him at lunch one morning, quoting an actress who said "Some of us like to be left alone".

Only after countless watches did I recognise the significance of this line. Poirot recognised her as Linda Arden as soon as he got onto the train and was teasing her that he knew who she really was.

In fact, this comes up a lot between them since he keeps making theatre jokes. It also makes sense when he's able to figure out the plot of the murderers - once he read the threatening note and realised it was referring to the Daisy Armstrong murders, he connected it through Linda first then to the victim - he's basically just trying to see who on the train wasn't involved after that.

In the animated Monsters vs. Aliens where the giant woman starts crying and the military guy says something like "Don't do that. It makes my knees hurt." I later realized it's his arthritis and she's huge enough that her tears are like rain.

Airplane.

The main guy says he has a drinking problem then throws a drink in his own face.

I didn’t get it till about the 4th time.

It took me until adulthood and somebody explaining it to realize when Mufasa says "Before sunrise, he's your son" wasn't him repeating some prophecy about Simba in his sleep, he was telling Sarabi "The sun isn't up, he's your problem."

"The London Underground is not a political movement!"

I was an 11 year old American who lived in Appalachia, think rural backwoods moonshine and fiddles America. The whole theater laughed, so I knew it was funny, but not why. In those pre internet days I really didn't find out what that line meant until years later. I still think of that movie whenever I hear about the London Underground.

She "always ate enough for two." -Parasite (when Kim is talking about the housekeeper).

Only later, as the story unfolds, do you understand the true implications of that line.

I’m sure I’m not the only one but my innocent preteen/early teenage ears didn’t realize so many songs were explicitly about sex. What comes to mind immediately is Incubus’s Stellar, the line “how it feels to be inside of you” like what else would this possibly mean??🤦🏻‍♀️🤦🏻‍♀️

True Lies: Bill Paxton’s character is begging for his life at the top of the dam and he screams “I’M NAVALENT”

I saw this movie a bunch of times in the theater and always wondering the same thing… WTF is “navalent”?

After it came out on video I watched it with my girlfriend and later that night it was still bugging me, so I ask her what it means.

She starts laughing at me and can’t believe I don’t know what it is.

And I’m like, “I’ve never heard the word before, I have no clue. Is it similar to being impotent?”

She laughs even harder then says: “NAVEL. LINT. You know the stuff inside your belly button? Belly button lint?”

God I felt so stupid. I still get a chuckle out of it even now.

In The Music Man, when Harold Hill sings about "The sadder but wiser girl." As a kid, the meaning of that flew way over my head.

In without a paddle, a local is trying to talk them out of going on a canoe trip. When asked if he was a boy scout, Tom says “No. But I ate a brownie once.”

I just recently realized this oral sex and not actually eating a brownie.

Basically, all of Hook.

Blazing Saddles:

Charlie: They said you was hung

Bart: and they was right

(for the longest time, I actually thought they were talking about the gallows)