A coin appears on your iPhone. As you move the iPhone, the coin moves around. If you tilt the iPhone enough, the coin "falls off the iPhone" and "into your hands".
Keep a coin hidden in your other hand. And tilt the iPhone so that it looks like the coin fell out of the iPhone and into your hand.
You can also play heads or tails by tapping the screen.
You can also switch from heads to tails by tilting forward.
My friend Charlie Chaplin (San Diego) thought this one up.