Collision detection offers this hilarious story of an arrogant hacker who escalated a geek chatroom dispute by claiming he could wipe his opponent's hard drive. Given his opponent's IP address, "bitchchecker" did indeed take down the computer's hard drive, posting gleeful incremental damage reports to the chat as he proceeded.
"you're so stupid," he taunted, "never give your ip on the internet."
Funny he didn't recognize the IP address. It was his own machine, which promptly expired and logged him out of the chat.