Note: Video contains a little foul language. Sailors, please ignore this warning.
Basically these asshats stuff a suction-cup tipped Nerf projectile into a real gun, pack the thing full of black-powder, and shoot some guy in the gonads. It looks like it hurts. Skip to about 2:30 for the actual shooting to begin. But warning: you may want to cover your own junk with a coffee cup while you watch. Haha, just make sure it's empty first -- MEDIC!
Thanks to Ryan, who once shot a friend in the ass with a blow-dart gun and would have gotten his ass kicked had he not coated the dart in poison frog.