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This is not a magic trick, but a fun thing to do. Ask your audience if anyone knows how to make 5 points star using just one rubber band. Odds are that nobody knows. Then you can make the star and even teach your audience to make it.
Materials: a rubber band.
Hang the rubber band on your left thumb and index finger (Pic 1).
Put your right thumb and index finger in to the loop of the rubber band and stretch the rubber band to form a square. The palms are facing each other and the right hand a bit below the left hand (Pic 2).
Twist the rubber band by turning your left hand outward and your right hand inward. The rubber band forms a letter X (Pic 3).
Stretch the right middle finger in to the loop of the rubber band on your left hand (Pic 4).
Use your right middle finger to stretch the part of the rubber band between your left thumb and index finger (marked with X on Pic 4) to your right hand (Pic 5 through 7). Congratulations, you have made the five points star. Have fun and happy twisting :)