Have you ever forum hopped around just being a complete ass until they ban you? I do from time to time and man is it fun. The best ones are going to smaller more unknown boards because it confuses people.
Starting flame wars, massive use of racial slurs, threads making fun of the boards and so on. I tell you...its a blast. Speaking of which I should use performance testing software to bomb the crap out of some forum with about a trillion new threads
EDIT: This topic needs to be bigger. Talk about how you are an ass in forums, chat rooms and online games.