When I was 3 years old, I cut my hand on Dad's gun cleaning kit. It was made of metal, and the edge wasn't all that sharp, but I managed to bounce off the couch, and right onto the edge. I had put my hand down first, to brace my fall. The doctor thought I'd lose my hand, but it is fine. I have no loss of use, and I eventually got all of the feeling back in it, so I was a very lucky. I have a nice diagonal scar all the way across the palm of my hand, which oddly enough, has grown with my hand, and it reminds me to stay far away from sharp metal edges!