On the oops parade for me:
Miswired a motor for a film projector once. It ran ok on test, a little noisy which I had dismissed as used motor, old age. Got to change it again when it burned up a day later.
One horrid make of projector console, totally fried wiring when I cross phased the power to the lamp rectifier. Ouch.
And when working for EC here in So Cal., lifted a shared neutral and fried a microwave and the electronic controls on a very expensive refrigerator. Double ouch.
And way back, fried my best screwdriver and burned buss in my parents Zinsco panel trying to seat a 2p 40amp breaker. My dad was sure I'd bought the farm! (I was 16 at the time.)
