So working around a live wire today, not capped, just hooked up and made live. When I retracted my tape measure, it crossed the hot and ground and neutral, nice spark. Needless to say, wires capped! I don't usually leave live exposed conductors....
Yes PTO shafts are dangerous. We have a guy on our prayer list at church from Alabama. His long hair got caught on PTO shaft, lost his entire scalp. Had one spot that was down to the bone on the back of his head. Got infected, now he will have surgery to move a muscle from his neck to cover that area.