Bottle, Bottle, Where's the Bottle?

This is sort of a variation of Three Card Monte, in which the puzzle is to determine the exact location of the bottle. It is an interesting variation of the Passe-Passe Bottle and Glass.

Performer places a bottle and two glasses at three different spots on the table. He covers bottle and each glass with a tube. Audience is asked to pick location of bottle and is unable to do so as bottle seems to jump about under the covers at performer's will. The bottle and glasses seem to change places under the covers at magician's command.