Speaking of rear spring owies..
Years ago I bought a pair of rear springs and put them on the floor of my 4 door car. When I got home I grabbed a spring by one end and pulled it straight out letting the other end hit the dirt.
I wasn't wearing gloves and when the spring hit the ground the leafs opened and closed in a split second tearing off the end of my thumb. About 1/8" x 1/2" an inch of flesh clean off.
I looked like this guy
but doing that sprayed the blood all over the door and ceiling of my garage (some of which is still there)
Talk about a bloody mess