"For my next experiment ladies and gentleman, I would appreciate the loan of any small personal object form your pocket. A key, box of matches, a coin - ah, key it is, good sir. Hold it up 10 feet over your head and watch out for the slightest hint of hanky panky... and behold before our very eyes a transformation! We've changed your key into... a coin. What happened to the key? It's been returned to you. Look closely, sir, you'll find the key back in your pocket. May we see it please?"
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