I was holding a board once and using a cordless drill to drive in a screw, I was really pressing down hard on the drill while holding the board with the other hand. The drill slipped off screw head and landed while still turning on the thumb of the hand handing the board. The drill ripped my thumbnail off instantly. That was body jarring pain. Unbelievable how much that hurt. Hot throbbing searing pain radiating from my thumb up my arm.
I just shuddered thinking about it.
And it's weird how tender that skin is where the nail was, seemed like it took forever for the nail to grow back.