There for a Reason.
1st place in Derby #288: Mad Science, with 387 votes!
You know those goofy warning signs you see everywhere that make you think to yourself, Why would they bother putting a "Do not place head in wood chipper" sticker on this thing? Those are there for a reason. Someone did that and thus necessitated a warning to cover the company's ass in the event of another moron following (law)suit.
Keep that in mind the next time your buddy has one of those "hold my beer" ideas and wants you to "just trust me, man, trust me." If it seems so stupid that you can't imagine a way out of it without an injury of some kind, trust your instincts.