Wii Remote Rubens Tube
Or "Control Fire with Wii Remote!" A Rubens tube is a metal tube with holes along one side that allows a small amount of flammable gas to escape. Instructables user "ScaryBunnyMan" made a mental leap, and experimented with forcing sound through the tube which changed the pressure of the gas escaping and produced a representation of a sound wave - in flame.
The next logical step of course is to hook up the volume of sound to a Wii Remote so that you can control fire with the wave of your hand ... and pretend you are the sorceror's apprentice.