I never do anything worse than send people e-mails from their own addresses. Well, once I changed a friend's LJ icon. Just small joke things.

Once way back when I was sharing my WoW account with my brother he gave two of his dumb friends the password and they went onto my character the day Half-Blood Prince came out assuming I'd be too busy reading to notice. They took a fortune in herbs and a large amount of gold. Even as a slow reader I finished that book in less than a day. If you can't tell, I'm still bitter over that. >.<