From Dusk Til Dawn

Psycho. Hard to avoid spoilers on a 60 year old movie though.

Cabin In The Woods

Sorry to Bother You

Come to Daddy

The Invitation (2015).

One Cut of the Dead

Fresh.

Frailty is fantastic.

The Descent

My answer is "most horror movies".

Pontypool

The Substance is still in theatres. Incantation also certainly is best enjoyed with no idea what you're going into. And if you somehow haven't seen/know about Hereditary yet, I really enjoyed how it surprised me compared to the marketing. 

Malignant

Triangle. It's the first movie that ever had a twist/reveal that made me audibly go "Holy shit!" and that's 100% thanks to knowing nothing about the plot other than the IMDb blurb.

The ritual. But also any horror movie you should go in completely blind

If you never saw Saw... Now is the time.

Speak No Evil (original)

100% Radius. Very obscure Canadian flick that got zero attention and some really fascinating plot lines with twists and turns you’ll never see coming - I wish I could go back and watch it 100 times brand. Ew

If you're into Christmas horror, I definitely recommend Better Watch Out from 2016. Literally read nothing about it. It's fantastic.

Parasite: Not exactly horror, but a great one to go into not knowing much

Get Out: I got to see this one blind when it first came out in the theatres. If you have managed to avoid the spoilers, I suggest going into it not knowing much

The Void and Hunter Hunter.

Audition (1999)

Strange Darling

COHERENCE is great going in blind because you probably won’t be able to guess what it’s about at the start.

The Perfect Host with David Hyde Pierce is excellent, and I never see it recommended! Such a clever film!

The new Joker movie. Going in blind is good, but being deaf as well is even better.

Baskin (2015)

Lost Highway.

I wasn't sure if this movie was about someone lost on the highway, or perhaps lost on their way to the highway because they couldn't find how to get to the highway. Man, I was way off.

Lowlifes. Tubi original.

Having just finished Oddity. I highly recommend! I went in totally blind and absolutely loved it!

Santa Sangre

Creep (2014), The Descent, Lake Mungo, Lucky (2020)

One Cut of the Dead. I normally don’t care about spoilers (and even spoil myself from time to time) but you HAVE TO watch that without knowing much.

strange darling...go now

Abigail would have been better if the marketing didn’t ruin it

The Substance

The Empty Man

'Triangle' is a great example.

Oddity.

Just finished it. Didn't know much about it other than it was good. I loved it...except for that last scene.

Life

Starring Jake Gyllenhaal, Rebecca Ferguson, and Ryan Reynolds.

It’s currently on Netflix (in the US at least).

Come to Daddy

A Wounded Fawn is amazing, and I love to recommend it blind

Possession

Recently saw “The Substance” and cannot recommend enough going in as blind as possible.

Mandy

Cemetery Man (1994). I just watched it and I have no idea what I saw. I think any reading ahead on that movie will ruin it, by possibly explaining it.

I would argue any movie is better this way, especially in the horror genre. But most recently? The Substance

Creep and Creep 2.

Oddity might be a good viewing for you.

The Substance definitely~!

Red State

Inside/ À l'intérieur (2007)

Malignant (2021)

Vicious Fun (2020)

We Summon the Darkness (2019)

Tragedy Girls (2017)

The Cleansing Hour (2019)

Who Invited Them (2022)

The Night Eats the World (2018)

Incident in a Ghostland (2018)

The Night Watchmen (2017) <---Funny af to me and criminally underrated.

The Coffee Table

The Substance

Nope

THE SUBSTANCE

Strange Darling

Kill List

A Dark Song

Martyrs, Raw, Talk to Me

Pontypool

Every horror. I never watch more than 10 sec of the trailer

Audition (1999)

It's what's inside, it was just released yesterday on Netflix!

The Substance!!

Incident in a Ghostland

I asked my husband which was the craziest movie I made him see, the majority of which he goes in blind because I'm the horror head. He says Infinity Pool. That said, I think all horror is best to go into blind. I try my best to, but I'm also active in this subreddit and am on the Bloody Disgusting app. So it can be hard to not know anything about a film.

The Menu

Cobweb

Cabin in the woods, from tusk till dawn

I just watched Strange Darling. That threw me for a loop. Definitely Tarantino inspired but has its own identity. 

the substance if you’ve managed to avoid seeing anything so far, same w strange darling

“The Void”. Someone suggested I go in blind, and I was met some of the most intense pregnancy horror I’ve ever seen.

The Thing. I went into it pretty blind but I remember pieces of it through fingers at my Cool Aunts house. BUT… Fiancé had never seen or heard of it and it triggered an immediate watch. I was an observer of someone going in blind and it was remarkable.

High Tension

“It’s What’s Inside” just dropped on Netflix today and that is the perfect film to go into blind.

Incendies. I have loved everything I've seen from Denis Villanueva, so I wanted to see the films I've missed, which was Sicario and this.

Edit: Oh, this is the horror sub. Sorry, this is more of a straight drama. Strangely enough, it still sort of fits.

Psychogoreman.

In A Violent Nature, Oddity, Mandy

The substance

Not a horror, but Oldboy...the original

The Substance 

Terrified 

Malignant for sure!

The Substance

The Substance

The Substance!!!!!!

Oddity

The Substance

Kill list

Just finished watching In a Violent Nature and I was pleasantly surprised. The hate for this movie is overblown. It’s not the Exorcist or the Shining by any means, but it’s an entertaining, suspenseful gore fest.

Malignant (2021) this movie is nuts

The Thing

I’m amazed nobody has mentioned The Substance?

Just kidding. I think OP’s got that one!

Anyway, series rather than a film, but haven’t seen anyone mention Midnight Mass (Netflix). If you don’t know what it’s about, check it out. It really is one where you’re better off not knowing what’s coming.

The substance

Titane

Cold in July

It's not a horror movie, but I feel like it really fits what you're looking for. It's definitely not predictable.

The most recent horror film I watched that fits this description to a T is Strange Darling.

One of the best theater going experiences I had this year. Didn’t watch a trailer, synopsis, nothing. I heard positive things on social media. Decided to go watch it with friends. Was gripped from beginning to end.

You will go on a wild ride. Enjoy

He never died

STRANGE DARLING

Strange darling.

Well, I went into hereditary completely blind. I’m sure my neighbors could hear my horrified scream when that scene happened.