http://sportsillustrated.cnn.com/2005/writers/pete_mcentegart/02/09/ten.spot/index.html

A Welsh rugby fan has put the "fanatic" back in fan. Geoff Huish, 26, was so convinced that powerful England would defeat Wales in Saturday's match that he announced at a local social club, "If Wales win, I'll cut my balls off." Wales won 11-9 and Huish went home, severed his testicles and then walked back to the bar before he was taken to the hospital. Let's face it -- that's one bet Huish should have welshed on. (Sorry, couldn't resist. Thanks to 10 Spot reader Scott of Columbus, Ohio, for the tip.)

Ouch.
It remind me of a part on the Last Laugh 2004 on Comedy Central if anyone saw it. They were making fun of the Master Card "What would you give for a Red Sox World Series ticket". They had guys going around collecting the crap people said they'd give. One guy said he'd give his left nut. They then approach him with a pair of gardening shears.
Ok, sorry for rambling, and now I leave with the thought of incredible pain.