I've banged the hell out of myself over the years, but the worst (grossest) injury I can remember was cutting my hand with a razor knife. It was when I worked in a grocery store back in my teens. I was cutting a box open and it slipped and I cut the top of my hand from my index finger down to my thumb, in that fleshy area. It cut a vein open and was literally squirting blood. I couldn't get it to stop bleeding and I ran to the bathroom with a blood trail following behind. Took about 15 stitches to close up the vein and wound, and it felt like I lost about 3 pints of blood in the process.
How bout you all. What's the worst you've ever hurt yourself?
First of all, there the human body only contains 3 pints of blood.
And mine was when I was working as a plumber. We were in a basement fixing a leak when the pipe snapped out of the joint and slit my head open. Took 17 staples to seal it up.