*genuine guffaw*
alternatively put a picture up in the entrance hall and wait for someone to say "woo" as they walk past.
( Tom O'Bedlam I have control of a tank, Thu 5 Jun 2008, 21:16, archived)

student union notice board
post a redex with an arrow from the word "fail" pointing at it. Then stalk observe.
( Pasanonic 's been known to cause insanity in laboratory mice, Thu 5 Jun 2008, 21:19, archived)