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.
Not sure if the time I was held at gunpoint by Chinese soldiers counts as a “physical altercation”, so I’ll say it was the time a “friend” decided his drug problems were all my fault and he headbutted me out of nowhere.