12VDC motors will oscillate briefly at 60 Hz when connected to a 120V source, then it explodes.

Hey, I was a preteen and tired of buying batteries!

Never really got hit until I was an apprentice. 240V through my left hand while holding a 250V 20A receptacle as the mechanic turned on all the breakers. This same mechanic (Virginian for "journeyman") was scarred head to toe from dropping a screwdriver into a live meterbase, and was the only electrician I've ever witnessed step through a ceiling. This guy was an accident waiting to happen.

-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI