A key is shown by the performer. It looks quite normal. Instantly strange things happen. The teeth of the key begin to move down around the shaft. The magician can even revolve the teeth so they are at right angles to the head of the key. Finally, the teeth are brought right down to the base of the key. They are still at right angles to the base of the key. The teeth are turned 180 degrees to the other side and then passed to the audience to examine forever if they wish. They will never, never, find the secret.