Ewwww ... I don't like the sound of that.
The worst I've ever done was to take a divot out of my finger when using my Record 044 (cute little plough plane, Jeff). I inadvertantly shifted my grip when steadying the plane and the next thing I knew I had made solid contact with the exposed iron. (And the irons on those planes are *totally* exposed.)
As O'Deen says, even I am smart enough to figure out when I'm cutting myself with a chisel or saw and stop before I amputate a limb.
Chuck Vance