when you're running late for class (not to teach one but to be a student in one) and your checking your watch and your like damn... almost there, but then they make everybody get out of the metro for a technical problem and take the next one, your like 'damn' but its all good you'll only be a little late.. and so you're walking down the hallway to the class.. 'good the door is open, i'll just slide on in, and take that seat right by the door' but instead your backpack hits the lightswitch, turning off all the lights.