Accidents can happen in the most unexpected places. I once worked with a chap who only had three fingers on his left hand, the hand appeared quite normal and there were no obvious injuries, it was just a three-fingered hand, However, one day at 'smoko' he told me what had happened. He was a storeman in a very large warehouse and they had a mile or more of small steel bins/shelving going up high enough to require ladders to reach the top ones. He said that he was up a ladder and fell. he put out his left hand to catch hold of a bin front and his wedding ring caught on a bolt that was sticking out, his full weight went onto the finger and it ripped out right back to the wrist; hence the neat appearance!! He said that when the insurance people inspected the shelving/bins there was only one bolt (his) that was put in wrong and had the thread sticking out and that there were over a million bolts.