One of the most fun experiences of my life was being 'set upon' by a fat drunk guy while walking home from the gym late and minding my own business.
I'm not a tough guy by any stretch of the imagination, but I work on the door occasionally so used to the odd scrap etc. I trained from 14 yo to my 21st birthday at our local boys club, only had a couple of bouts and never took it completely seriously. Anyway, this fat dude missing me with his first 'haymaker' lol, was the beginning of the end haha. I actually fucked around and jabbed him about 5 times (at one point I had actually stepped almost behind the guy without him registering me and could have easily just choked him out lol)
Anyway, whatever the budding wannabe mma streetfighters say - when it hit the fan I was very excited that I had learned to methodically punch someone to pieces without getting hit back.