A friend got hit in the eyebrow by "a sharp rock" while mowing the lawn. A few hours later, he was in the hospital with a swollen half a head. (swollen on one side, not half his head missing and the other...nevermind). The x-ray showed a wire, like you close a loaf of bread with, only like 2 gauges thicker, lodged in that skull socket behind your eyeball. It was a skillful operation and he fully recovered, but you never know. You just got lucky. That hunk of steel could have killed you.