my buddy used to work in engineering at a high-rise which had a "transformer room" in the basement...big solid metal bus bars connecting the 'chit to the city, etc.
apparently some years before a dude walked into the transformer room & forgot to remove the small wrench from his shirt pocket & bzzzzt! ...didn't leave in the same material form. fire, smoke, the works. dust to dust, literally. the co-worker who witnessed it had to quit. fuckin' awful.
"don't be a hero"