Has it got Power?
Barry was an asshole. Everyone except Barry knew this, and only the fact that he was far senior to most of the shop kept him from general ridicule and rebuke. Our shop fixed medical equipment for a large hospital, and Barry had a habit of turning up at your shoulder asking the most insulting and basic questions:

Is it plugged in? Has it got power? Did you check the fuse?

After a safety inspection, we were all issued new lighting for our workbenches. However the lights came without switches or power plugs, having been designed for permanent installation on remote circuits with wall switches.

This didn't present a problem to us, we had plenty of plugs and switches. All of us wired up our new lights without difficulty - except Barry.

Barry managed to wire his switch so that it was a direct short. When he flipped the switch, the switch went up in smoke, the wires in the conduit rattled, and the circuit breaker for half the building tripped with a loud snap!

Cue the general cries of "Hey, Barry - Is it plugged in? Has it got power? Did you check the fuse?"

Too funny. Then we helpfully pointed out that he'd wired the switch backwards. He rewired a new switch, and this time he confidently called out: "Let there be Light" before he threw the switch and plunged us into darkness yet again.

We laughed so hard we all cried. Months later a call of "Let there be Light" would reduce us to a puddle of laughter.

Barry pretty much kept to himself after that, over at his dark workbench.
(danalan Pretty good, for an amateur., Sun 20 Dec 2009, 17:55, Reply)