Toribash
I love them. When they lose and start spouting insults and threats, everyone laughs. It's like the kid at school who is always flipping off the teacher or something. Hilarious in it's own way.

Annoying when a white belt named cvhyfcluiv starts shouting insults in Portuguese, all caps, then quits the game in the middle of your match, though. This happens at least once a day to me. God, I love toribash.
Boerhae, making a glorious return!