Swords, knives and sharp objects of any kind should seriously be kept far, far away from genitalia. (Did ya see the movie Seven? Just thinking about it makes my privates yelp in pain.)
Two dumb blokes in Bulgaria were drinking and having a jolly good time when things took a turn for the terrible and someone lost his weiner. Click here for the full gory tale, though this quote is enough to make you shudder: "I thought he'd missed, but then I felt a burning pain and collapsed. He'd sliced the sword through my trousers and lopped off my penis."
And that's not even the worst part of the story.