Using a drill press drilling a 3/8" hole on a piece of 1/8" flat stock. The metal was 2" x 10" and I was drilling the end while holding the other end. You know where this is going. Bare handed, the drill bit caught as it went through the bottom side and ripped the metal out of my hand- That got my fingers as it left, and when it came around it ripped into the palm of the same hand.
Still got the scars. I make sure I clamp everything these days.
Anthony