When I was in eighth grade, some humongous kid in my gym class kept bullying me in the locker room. He lived up the street from me but I didn't know him well because he only had lived there a short time. My aunt taught science at my junior high. One day she was at our house and saw this guy walking down the street to get the mail (communal boxes). My aunt told my mom "[kid's name] is in my science class and he is one school violation from being expelled. Do you know him?" (My mom didn't).
Eighth grade me gets an idea, a horrible, nasty idea. Since my gym locker was next to this kid, I had seen him put in his combo before. He wasn't careful to hide it (because he was not very bright). I decided that I was going to put an old hunting knife into this kid's locker and then report him for a weapon at school. The knife came from a big bin my grandpa had of busted hunting gear.
And I straight up put this busted knife in this kid's gym locker and reported him on the district safe school website.
He ended up getting expelled and his family moved a month later when the school year ended.
So I framed a guy and probably ruined his life. I don't know his last name, so I have no idea what ever happened to him. But I've never been sure if I should feel like a jerk or not. It was obviously a bad decision on my part. There is a good likelihood that this guy has some emotional trauma over being framed and expelled. I never even wiped the knife for prints, so I might still have some blowback over this if they ever check for prints 20 years later.