Another one:
One of my sisters, Sarah, was taking a class last semester witha really rude professor. She got up in class one day to go to the restroom (she was really quiet and unobtrusive about it, so not to disturb his lecture). She has her hand on the doorknob and the professor stops speaking, turns to her, and says, "Where do you think you're going?" Sarah, a little aback, says, "Uh, the restroom." He flips out, saying "No! Sit back down. Go to the restroom on your own time!" Keep in mind, this is a 2 1/2 hour block class with no break. Sarah, pissed off at his attitude, pulls a tampon out of her pocket, holds it up, and says, "Fine, would you like me to change this here, then?"
That shut him up
