I was changing out some panelboards at the local volunteer fire department. One of them was a 120/240 delta. Shooting the breeze with a couple of fireman while connecting up the circuits. Not paying attention, I just plugged in all those single pole breakers in a line. Luckily, I only melted their VCR, for some reason, it didn't get along very well with the 208 volts.

Tom

Few things are harder to put up with than the annoyance of a good example.