Such a Commotion
If you would like to play a trick on a friend, send him one of these contrivances in an envelope. It consists of a stout card, folded into three. To the card is fixed a U-shaped piece of wire, held firmly in position by means of a gummed label. At each end of the wire is an elastic band which, together, grip a ring made of wire or any light metal.
When all is ready, twist the ring over about twenty times and so knot up the rubber bands. Then, carefully fold over the two flaps of card, without letting the ring uncoil, and slip the uncanny thing into the envelope.
Your friend receives the letter, tears it open, pulls out the card and to his horror the ring uncoils itself. It will give him the fright of his life.