My buddy got a phone call one night while he was at work. His wife (an avid DIY'er) was renovating, and suddenly "the sawzall made this BRRRNDT noize, and sparks came out of the wall... then it didn't work anymore".
Turns out she'd found a new way to terminate NM cable without visualizing it first.
Doug, I've been called out for everything from CATV guys, plumbers, drywallers, insulation shooters drilling through wires to a homeowner that was trying to hang something in his garage, not thinking about it., he drilled into his panel on the other side of the wall, through the can & into the bus! It didn't damage the bus too bad ..(It seemed incinerating his drill bit cleared the fault before major bus damage occurred)