"One dollar! Pie the Professor! One Dollar!"

American universities celebrate today as π Day. (Guess why?) The CMU Math Club organised (what seemed to me a trifle barbaric) event called "Pie the Professor," with an entry fee of $1. Curious why I called it barbaric? Hint: Pie is used here as a verb. Still don't get it? Watch the video! (1.92MB)

(Click on the thumb-nail picture to view the video.)