Mix around the magic rattle bars. Only the magician can get them to rattle. Here's how it works. The magician displays three plastic bars. You then pick up one of the bars, you shake it and it rattles. You then place the bar back onto the table. You pick up the other two bars, showing that they don't rattle. Slowly the bars are moved around on the table and the spectator is asked to point to the bar that was shown to rattle. Whichever bar is selected, that bar does not rattle. They will only rattle for the magician.