Killer Red Caps

Five red plastic caps are on a table. A spectator is instructed to place a small object under any one of the caps after the performer has left the room. The caps can be mixed, or moved, it's up to the spectator. The performer returns. Instantly, he knows which cap contains the object! In it's barest form; it's only a one in five chance. But as we add the smoke, and presentation, the effect soars.