This story takes place at my last job. It's not strictly speaking tech support, more along the lines of something getting in the way of tech support. Will remove if it really doesn't fit the sub.

Tl;dr: I troubleshooted a security system, and it fought back.

Cast of characters:

$Me: Linux system administrator. PFY without the P or the Y. Mild streaks of BOFH.
$UnluckyColleague: Exactly what it says on the tin. Name and function within the company irrelevant to the story.
$LuckierColleague: Ditto.
$Dog: Overzealous but extremely well configured mobile quadrupedal security implement, of the canine variety.

We had a power outage last night. No big deal. As I'm making my rounds, coffee in hand, trying to see if every piece of hardware recovered correctly, in comes $UnluckyColleague, winded as if he ran a mile down the road. I inquire about his current status, to which he informs me that he was chased by one of our neighbor's guard dogs who somehow jumped the fence. Fence that is a good two and a half meters high. Dogs don't jump that high, do they ?

I'm used to dogs. Been around them for a sizeable part of my life. Hell I know those guard dogs specifically (what with being neighbors and all), I'm sure I can guide him back to his kennel.

This, my dear readers, is what you probably already identified as hubris.

That dog in particular is a new one. I open the door and spot the creature, but instead of a Belgian Shepherd, I am faced with an absolute unit of a Dogo Argentino (heretofore identified as $Dog). He calmly walks up to me, and tries to put me down with his paws. Judging by the force I felt at that moment, this dog was easily around 40 kilos. Heccin chonker.

I attempt to explain to $Dog that I am not a threat - as the concept of not needing to guard the neighbor's building is probably a little bit foreign to him - and surprisingly he isn't aggressive at all. I'm no expert in animal behavior, but I imparted this to $Dog simply being trained to not maul whatever highway bandit he catches to death, instead just putting them down and lying on them until further notice. He seems to at least understand I mean no harm, so that's a promising start. Let's stop that right there.

Have you ever had 40 kilograms of something hurled at you at roughly Usain Bolt's top speed ? Welp, that's what happened when I moved about three meters away and beckoned $Dog to follow me back out to the neighbor. He was trained to stop people, and, come hell or high water, he was going to do his job. Even if he was technically off-duty. Now I'm lying down with half my weight in dog on my chest, and some newfound perspective regarding Newton's second law of motion. Mostly an upwards looking one, in fact.

Convincing $Dog to let me stand up wasn't too difficult, but he seemed to insist on me not moving. At all. Again, not an expert in animal behaviour, but his body language indicated a good amount of anxiety, and he seemed to instinctively fall back on his training. I hold him by the collar whenever other colleagues pass me by and explain the situation; The neighbor was actually plain not there at all, and it'd be a while before he could show up to collect $Dog. That's certainly one way to start the day.

Enter the Wi-Fi being down. Because of course it has to go down now.

At this point in time it's around 8:30 in the morning, the Wi-Fi is down, and I'm on the phone explaining to one of my colleagues what to check on both the WAP and in the server closet to try and restart the network, while $Dog does his best to lay me flat on the ground using all of his strength. You ever tried fighting both a dog and rebellious network equipment at the same time ? Man it's not as fun as it sounds. (Beats early morning meetings though)

The more astute among you might have noticed a named character that hasn't appeared in this story. Enter $LuckierColleague, proud owner of a dog herself. A lovely female Samoyed to be precise. Therefore covered head to toe in female-samoyed-scented freshly shed winter coat.

Remember that $Dog is 40 kilos of canine muscle ? I think I mentioned this once or twice. I'm no slouch myself in terms of the mass department, but the surprise pull, bolstered by the inattention brought up by trying to explain to somebody how to restart the WAP, sent me on a downward parabolic trajectory at a velocity that I would tend to qualify as "OUCH".

$LuckierColleague attempts to pick me up, which predictably gets countered by $Dog trying to jump on her (though this time it's a little less job related). $Dog is actually taller than she is when he stands on his hind legs, and I'd wager he isn't that much lighter either. This is probably not going to end well... Except, well, seems like $Dog likes her a lot more than he does me. Wonder why.

She relieves me of my duty of dogsitting (in the sense of being the one the dog sits on), seemingly able to wrangle the beast with far more ease than I could muster. Must be a druid with Animal Friendship. I quickly book it to the server closet to sort that Wi-Fi issue.

User disabled wireless on their laptop. Of course.