Flipper Coin - Quarter
2 Quarters are freely shown and placed in your left hand, you tell the spectators that the weight of the two coins is too heavy. Now you give your left hand a rest by placing the coins in your right hand.After a few moments your right hand gets tired also.
You solve this problem by lessening the burden of your right hand by instantly causing one of the coins to magically travel to your left hand. You now have Quarter in each hand.