A 28 ounce framing hammer with the waffle head is a big threat. Especially when you are using it both right and left handed because of space and geometric issues. Both hands survived, perhaps because I got all the damage out of the way with lighter, smooth faced hammers before moving onto the hammer of the evildoer.
When I was fresh out of college, work was pretty hard to come by. It was the recessionary times in the early 1980s, and I worked in a deli, among other odd jobs, to avoid living under a bridge. The deli was on the Upper East Side of Manhattan, and was frequented by people who had a somewhat inflated sense of self worth. One woman was insistent that I slice up the end of a salami, because she wanted the smaller diameter slices. In order to do that, I would have had to use my fingers to push the very short piece of salami into the slicer, because the guard/pusher wouldn't get the end close enough to keep slicing after a certain point. So, I refused to do it. It didn't go over well, and the deli manager, who was about a year older than me and just as broke, came down pretty hard. I told her she could stick her fingers into the slicer if she wanted, but I wasn't going to do it. Funny how people see the light when their skins are at risk. Plus, an hour of my time was worth less than a half pound of tuna salad to the deli. It wasn't worth taking any risk or any nonsense. I started driving a cab shortly after that. It was a step up, believe it or not.
Moral of this story, don't let anybody else put your fingers at risk, either.