Er, stuff I won't mention....but...
Only time it's fun is in HOCKEY.

I'm a small 5'10 guy but the adrenaline rush made me fight a 6'4 defenseman who had at least 70 pounds on me because he called me a chink. I got the first punch after tossing off his helmet (he wore it like a baseball cap w/the visor) and a few thereafter, but fortunately before I got destroyed our enforcer came to my aid.
Another time a guy tried to hit me from behind on purpose (very very bad) so I got so mad I tried to knee him (very bad) but ended up hip checking him. He was yelling profanities on the ice so I jumped on top of him and pound pound.
Nothing to be proud of-- fighting dirty, but it's better than losing. Best part about it, your only penalty is a game misconduct. No jail time if you stop when the refs say so.