Boomerang Card by Yigal Mesika

Imagine! At any time during your act, you demonstrate your incredible talent of spinning a card off the top of the deck, and having it shoot out towards the audience. When the card travels about ten feet, it does a 180 degree turn and returns to your hand! The audience will be picking their jaws up off the floors, and they will think you have supernatural powers! The little thread box contains 30 feet of invisible elastic thread that can stretch up to 5 times its length.