This story happened in a College of Surgeons Rugby game.
Story goes like this, in the course of the game a guy is unfortunate enough to dislocate his leg. He is screaming in agony. The pitch is full of trainee medics and they realise this fairly fast. They call an ambulance but also realise the quickest way to put the guy out of his agony is to push the femur back into the hip joint. They go ahead and do this. Unfortunately the screaming intensifies as a result, the poor guy has gone from occasional moans of agony to squealing like a pig getting slaughtered. Within a few minutes he has passed out from the pain.
The reason?
When they pushed his femur back into his hip socket, they managed to catch & snag one of his testicles along the way and ram it into the ball of the hip joint ahead of the femur they were trying to re-locate. When the bone snapped back into place the testicle was squashed immediately because of the strength of the ligament and tendons attaching the leg to the pelvic girdle.
The guy lost his testicle and ruptured his vocal cords screaming in agony.