Yeah man a lot of drugs seem to cause OBE's. Also, just about anybody who's ever had a real high-dose trip seems to have had an OBE at some time or another. Shrooms and ecstasy especially tend to give you those psychic phenomena and "in someone else's head" feelings.

In other words, that's one crazy fucking trip. I don't think I could ever bring myself to take 1000mg, that shit's insane.