With thanks from economist Ed Daughty "The Magnificent Mogambo's U.S. Dollar Index Predictor." You paint a dollar sign on a rock, which you can also use to defend yourself, and (according to the instructions), "Hold the rock in an outstretched hand, making sure the rock is well away from your body, then say aloud 'Oh, Magnificent Mogambo U.S. Dollar Index Predictor, what will the dollar's value be over the long run?' then let go of the rock." It's uncanny how accurate it is! And just in time for that holiday gift-giving season, too!