My dad likes to tell a story from the '50s. My grandfather was a carpenter, and my dad would help him in the summers. This was on the Texas Gulf Coast, a very humid and rainy place. After a fresh rain, you really didn't want to touch the circular saw, since you knew there was a fairly good chance of getting popped.
My grandfather's boss was one of those rare people who could not feel an electric shock. This is not exactly a good thing. The tool that no one else would touch, he would pick up and use. He would be utterly unaware of the current flowing through his body, at least until he finished the cut. That's when he would realize that he couldn't let go of the saw.
By the way, he didn't actually consider this a problem. After all, to break the circuit, all he had to do was jump up in the air!
