I had a warning once for some stupid comment (even had Stof I believe cus as me in a mesage because of it) but I've never been banned that I know of.
-edit-
Just looked through my messages, it was stof that warned me. It was because I posteda Whambulance pic because I thought someone was being a whiny bitch and he didn't think so much.
Stof's right, that guy is a prick.