Wrist Snap
Description Flipping the coin on the wrist.
Start Hold the right hand out palm up and place a small coin on the right side of the wrist near the base of the palm.
Directions
  1. Snap the thumb and middle fingers. The coin should jump up into the air and lend back on the wrist.
Comments
 By adjusting the size and weight of the coin, the position it is placed on the wrist and the force of the finger snap you can get the coin to jump different directions and height. You can also get the coin to flip 180º.

It is possible to get the coin to jump and flip without the snapping of the fingers by moving the hand in such a way that the tendons and muscles in the wrist cause the coin to move. I have never been able to do this but met a guy who could do it.