What's the dumbest thing that's ever set you or someone else off?

A lot of dumb incidents. Idk maybe my p.e teacher in high school. She always favourited other students over a select few including myself.. for whatever reason and it was so damn obvious so I confronted her after detention and told her what I thought. She didn’t like what was said so she tried to leave the room by slamming the door but they were the kinda doors that slow down when being closed and that made me laugh hard because it totally ruined the dramatic exit she was going for.
Anyway, she didn’t even acknowledge what I had said and I didn’t say it to insult her, so I approached her again to say and I quote- “I’m sorry if you felt like what I said was rude” she responded with “i’m sorry YOU felt like I do that” basically insinuating that it was just me being problematic so I laughed and said “never mind, I take that back” then walked off. She reported me to the head of p.e because of it.

Lol good times.