This isnt the first time Ive heard of something like this. A co-worker had his ring finger cut off on a construction site when he went to jump down from a 3ft gap and slapped his hand on a wall above him and his ring got caught on a nail and BOOYEAH, off came the finger. He didnt realize it until he finally looked down and then went into shock, not from the pain but from the realization that his finger was missing.