I kid you not, this is 100% real shit, but I was once in a 20-30 man battle royale that started in the driveway thing of Athenas before spilling out into Central Ave. People were getting slept left and right (not by me, this time) but I remember turning my head on 3 separate occasions during the brawl just in time to see clean knockout punches.
It all popped off when one random guy stole on this other guy outside, and it escalated to each of their entire group of friends (I loosely knew the guy who got stole + his friends, so I was on their side.) plus a few random drunks going to war.