If you’ve never been in one, no need to comment “never”. For me it was over a decade ago as a teenager at a state fair. Quick fight broke out between an annoying guy and myself. He was following my little group around tossing stink bombs at us. A little pushing turned into a little punching. We both ended up in cuffs but neither with actual charges. We were both banned for the following 2 years from that fair.
Probably middle school. Not really an altercation, just the last time I can remember being violent. My school bully baited me with insults and the teacher ignored it. I snapped, picked up a student desk and hurled it across the room at him. Missed, but it scared him enough to shake him. I got a talking to by the school principal, but that bully never bothered me again.