My most significant scary thing wasn't high voltage, it wasn't even 120v. it was 1.5vDC but at about 150 amps. People can get very sloppy when the voltage is confused with a flashlight battery. The guy I was working with got his wedding ring across 2 bus bars on that supply. It was white hot in less than a second. We yanked him off the bus and doused it with coffee because that was what we had handy. The paramedics had to cut it off to treat the burn. He didn't lose the finger but it was never right again.
I have not worn a piece of metal on my body since.
