Hand the plastic tube out for examination while casually handling the two ropes. Take the tube from the spectator and twist the ropes so they can be inserted into the tube. Then pull 2 loops up through the top holes so you can insert your right wrist. Taking one rope from each end tie a simple overhand knot. Have two people hold onto the ends of the rope and at the count of 3 pull hard. At the same time flex your wrists and break apart the snaps sending the tube flying and escape from the tube cuffs.