I would take a lot of this with a grain of salt, the stuff that has no verifiable source like video, which some of the stuff on that Wikipedia entry does. I have a bootleg (soundboard audio) of this particular show and there's absolutely no indication of anything going on other than Mike singing - you know there's be some kind of big crowd reaction to him doing this, not to mention him being distracted from the song, and there's nothing. Patton's got a big legend growing around him for being a freak, but I think a lot of it has been GREATLY exaggerated and just plain made up (like the piss-drinking - I have yet to see an actual account of this, just people saying it happened.) I don't doubt he's a weirdo, but some of it just seems like the kind of thing that results from people playing "telephone" for 15 years - it seems too ridiculous to be true.