valve spring compressor
you're one of the lucky ones.
I was hit square in the forehead with a valvespring on an all-nighter in the garage at 3 am. It hit me in the head, and bounced completely over the car to the far side of trhe garage.
To this day anytime I go into the garage my wife makes sure to remind me to watch for those flying springs.
Since then I bought a nice heavy duty compressor that doesnt bend or slip...it was for my security. ;)