Here's one..,
How about walking through the substation on your way to break and accidentally brushing up against the shunt-trip for the main to the whole General Motors main headquaters building.
Had to go through the whole sub killing all the switches just so we could reset the main and then go back and throw all the switches back on.
We finished and sat down like nothing had happened just as the suits started pouring through the door.
"Must have been an Edison problem."