I honestly couldn't pick a single time that I have been exceedingly angry, hateful, etc towards someone.
I'm generally a pretty nice guy, I won't go out of my way to screw someone over even if I don't like them.

I guess I've ruined a few friendships unintentionally by sleeping with my ex's friend. Her ex (who was a mutual friend at the time) wasn't to happy about it either. Like I said though it was completely unintentional, I got drunk, so did she. Nor did I think it would bother either of them, their relationships had been over for at least a couple months, but oh well. Now none of us talk to each other except for the girl I slept with and me.

I pantsed (debagging?) one of my really good friends in front of a bunch of girls, one in particular that he liked, for no reason. I later apologized, but it was hilarious at the time.

I've played with a few girls hearts because of my fear of commitment although I'm not entirely sure thats the reason I always second guess myself before I get into a relationship.

Yeah, pretty low class stuff, nothing huge.