Well I heard this one quite some years ago.....this guy goes into an ER (apparently this happened in the US) and wants only to be attended by a male doctor. The doctor asks him what the problem was and he points to his nether bits and says he was having problems urinating - he is obviously quite embarassed that he has a problem there. Eventually the doctor convinces him he needs to actually take his pants off so he can examine him. The doctor then takes a look and sees not only is the guy missing a testicle BUT the one that is left is looking rather black and nasty and swollen to the size of a grapefruit. The doctor decides that immediate surgery is warranted. Upon surgery, they extracted forty, rusty, industrial sized staples.
After the surgery, the surgeon had to satisfy his curiousity and asked the man what happened. The man worked at a factory. He was in his forties and a bit of a loner. At lunchtime, when no-one else was around, he had taken to getting a bit of pleasure from the vibration of one of the conveyor belts. Unfortunately this particular time, he got a bit too close to it and his whole package got severed off. He panicked, so re-attached what he could find with a staple gun! Apparently the missing testicle was never found........
Ewwwwwwwwwwwwwwwwwwwwwwwwwwww!! >P