HybridM had a really strange thread a while back. There was a story started that was....different. Basically, there was questions as to whether or not it was a story or the truth. He posted it, and it received decent feedback (there were technical issues, but it was well written). then the thread devolved into what was basically a multiple personality rant between him and a friend, or between him and himself.
Careful with this one. I got a little creeped out, and the thread was already over.