Hm, the old uninvited sneeze question. It's pretty scary, actually. I try my best not to do it. I'm afraid my large intestine will end up hanging six inches out of my ass and turned inside out. On the other side, if you finally got ahold of a turd that's been fighting you all day, it may get pinched off and run back in. In those cases it's tough to get back going since you're already weary from round one of the battle. Best to take a rest, drink some apple juice, and come back later. But you asked...