This actually reminds me of an incident in high school.
One of the teachers was younger and pretty cool, and one day we were told there would be a substitute later that week, but the teacher wanted to help us mess with the sub, so instead of Literature class that day, we practiced humming at a super low volume to make the sub question their hearing, gracefully dropping pencils and books at opportune times, etc.
Well the day finally came, and sufficed to say we failed at being discreet and the sub got pretty pissed at us. The scheduled lesson was abandoned, and instead we were told to write a short essay about how we should behave in class and the lessons we should be focused on.
Well it was high school lit, so we were reading some books that had adult themes and things, and some of the kids wrote that we were learning how to identify prostitutes (some character had a different woman visit all the time) or how to murder or whatever.
The next week the teacher was back, and because of our shenanigans and the essay content, we heard that they basically had to fight to keep their job, and damn did we all feel like fucking idiots after that.
I still think about that teacher from time to time. I hope they’re doing ok.