The setup: balance a nickel (the prize) on it's side on the table. Balance a wooden matchstick on top of the nickel. Finally, cover the whole arrangement with a plastic cup or pint glass (whichever you discover works best for you).
The method: this one sounds impossible (and it almost is)... No amount of blowing, shaking, tapping or physical manipulation will get the match off without setting off the alarm... However, if you use static electricity to charge a straw (as we did in the "science friction" episode), you can use the attraction to pull the match off the nickel without setting off the alarm!