Take a ruebens tube, "A Ruben's tube is essentially a demonstration of standing waves in air". Think a propane filled tube will small holes drilles on top. By forcing sound waves though, you manipulate the areas of pressure...high pressure, high flames....low pressure, low flames.
Now control that with a wiimote....I think the blueman group song is very appropriate:
Full instructions here:
http://www.instructables.com/id/SFD3NQXF5VMX94O/
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