Well........when I was a very junior Dr. at the Royal Sussex County Hospital. I was asked to go down to casualty to see an 18yr old boy with a spring up his backside.When i arrived there was a lad with his trousers down and a chest expander spring hanging down from is anus. When i asked him how it got there, he said "I saw it on the floor and was "wont" to sit upon it. X-Ray showed he had pushed half of it into his rectum. This was removed under anaesthesia, but he then developed peritonitis because a hook had penetrated his peritoneum. This "hole " did not settle and he had to have a colostomy, but eventually this was closed and he was discharged.......but not with a spring in his step. ;-)