"And then, with a mighty roar, the big Rolls-Royce generator started up and delivered 415v instead of 240v and blew up every system in the building."
Another tale from my roadie days:
We'd always verify the voltage before connecting to the power distro. A whole lot of expensive audio equipment doesn't do well with double (or 4x) the voltage they are set for. The owner of the sound company did the testing and made the connection to the sound system power distribution panel. Replacing the whole sound system on show day wasn't an option. The owner never delegated the task and we never damaged our gear. I didn't ask why that procedure was in place, but I can guess.
Biting the hand that feeds IT
