Years ago as a farmworker, I was driving rebar with a sledge hammer, to support raspberry canes, holding the 9 pound (?) sledge with my right hand, and don't ya know, I missed the rebar, but my fingers didn't. Cut my index finger, right hand, not bad enough to need stitches though. Working as a carpenter, several times I have hammered my left hand fingers, but those were minor injuries, although one time I passed out from that in freezing cold weather. I can see from your alls stories, I have been lucky, so far.