i saw something like this a few years ago, it was a guy trying to pry out a pipe in the ground, he was using a 2x4 on a rope as a lever , the pipe was moving, the 2x4 got on an angle, and the rope slipped,, he got himself right between the eyes, knocked him out , cold junk on the ground,, funniest thing i have seen, when he came to, he asked okay , who hit me, and why, with his fists up,,