Playground Australia Special!

A schoolroom version of the game show "Wheel of Fortune", also called "Duster Roulette".

On any hot summer day in Australia, the ceiling fans in each room will be running at the highest possible level. When the teacher leaves the room, a student in the front row dashes to the blackboard, picks up the board duster (which should be one of those big old wooden ones, not these modern foam versions which are, frankly, shit), screams "Fan of Fortune!" and then throws the duster into the fan.

A number of outcomes can occur:
1. The miracle of the duster passing through the fan untouched.
2. The fan smashes the duster in a sideways motion, sending chalk dust all over the room.
3. The fan hits the duster and propels it downwards on to someone's head. Hard.

Naturally, (3) is the best outcome. I still recall with fondness the moment when Patrick Dwyer - the fat-ginger-freckly-twat - got hit by the duster above the eye, splitting his eyebrow and spilling claret. Fantastic.

Alternatively, attach one end of a metal slinky spring to one of the blades, retire to a safe distance and switch on. Congratulations! You've just created a whirling blade of terror causing maximum damage over a large area, with the brilliant included risk of blinding everyone in the room.