I guess I'll throw in a few. This guy has been banned from the FTP forum probably about 20 times. He is an absolute nutjob, but apparently is one hell of a poker player.
This next guy, I had the pleasure of facing over and over in a bunch of low stakes heads up matches. I played probably about 30 matches with this guy, and he went all in on every single hand of every game. I decided to look him up at the time, and he was at the point all the way at the bottom, between 325 and 350. After he decided to stop playing against me, I kept an eye on him for the rest of the evening, and then he went on to win a $69+6 45-man SNG for like $1200 bucks, explaining the massive jump. Even after his big win, he apparently has decided to go skiing right back down the slopes again.