Borrow an ordinary quarter from a spectator. For best effect, the coin can be marked with a Sharpie marker so that the coin can be positively identified as the same borrowed quarter at the end of the trick. Put the quarter in your pocket, and instantly take a small box out of the same pocket. The spectator is asked to open the box. Is the borrowed quarter inside the box? No! Inside the box is another smaller box. Inside that box is another box. And inside that box is another box! When the spectator opens the smallest box- THERE is the marked quarter! The spectator is speechless!