Place the rubber band around the base of your index and middle fingers of your left hand. If the band is too loose, put it around twice. (Experiment with the tension.) The back of your hand is toward the audience, and your palm faces you. Close your left hand into a fist, at the same time use the index finger of your right hand to "point out what you're doing" while secretly stretching the band down so that all four left fingers can be inserted into the rubber band. Now straighten out your fingers and the band will automatically jump to a new position around your left ring and little finger.