Blow up a balloon (not round and elongated). Show the audience that he does not want to stay on the wall comes down. "What to do with it?" you ask and, as if deep in thought, rubbing the ball of his head. - "I think I need to start a thread and let the air out of it, if he does not listen... What? Ball says that is not necessary, he will be obedient". You hold the ball to the wall - as if he sticks to it. Has electrify because!