I've unfortunately seen people do this on an aircraft. I've also seen people arc weld multimeter leads to aircraft . Scariest was when changing some fuses on a IR countermeasure set; my boss said he had pulled the breakers, so I went ahead and started to swap out fuses...I learned my lesson that day...one, that boss was an idiot...two, I was a noob.
OT, need more pics of remodeling!