I myself had an incident when studying engineering at college. As part of the electrics module we had to go to the colleges main electrical plant room (a quite small cupboard or want of a better description) and draw the things we saw in there and say what they were, etc. Any road up there must have been 7 or 8 of us in there and I spied the main breaker for the whole college, it was a kind of one armed bandit style thing chuffing great handle you pulled to cut the breaker. Anyway I knew what it was and not to touch. But on the side of it was a small little toggle switch, which (to this day I don't know why) I decided to press. CLUNK the entire campus went in to darkness, lecturers coming out of rooms wonder what was going on, etc Turns out said switch was the test button for the breaker! We were all good mates and stuck together and said my A4 binder had knocked it. The college clock and bell was about 5mins out for the rest of term.
Biting the hand that feeds IT
