I was changing a flat tire on my bike -- a Schwinn Sidewinder -- when my left thumb slipped and cut a flap of skin from my right index finger. I looked at it for a second than watched the blood spray. I had no idea what a thumbnail can do to you! Those things are dangerous! You can mangle someone with them!
I had to put the flap back in place with a Band-Aid.
Then I had to call a woman to come over and play Mommy for a while.