A Mexican WoW player named Bronco Carson got beat up in real life by the husband of the player he had been repeatedly ganking, as well as a few of the husband's friends. Apparently, he'd been killing the heck out of this woman's character, which is reasonable enough, although somewhat annoying. The woman started threatening Carson at some point, but hey, it's the internet, right? They don't know where he lives.
Wrong! Carson seems to have decided that a good idea would be to give the woman his address and and ask "if her husband was man enough to just come meet me to settle this." Um...bad move, sir. The husband and friends came and beat him up, netting Carson two broken fingers, a fractured wrist, and a destroyed computer and entertainment center. The moral of the story: if you're going to make life hard for someone in-game, don't give them your address and taunt their husband to come fight you. You are not prepared.
Note that this story may well be fake, seeing as how there's no terribly credible source for it -- all the references to it I've been able to find trace back to this story on Fun Tech Talk. Grain of salt and all that.
P.S. Just so we're clear, beating people up isn't cool, especially when it's three against one.