Magician can create such miracle as to penetrate a coin into a cup in short distance. A transparent cup, on which tied a piece of plastic leather, and two coins on it, these are the stage property. 
Then the magician asks an audience to pick a random coin and starts his performance. Under his magic fingers, we can see the coin passes through the plastic leather and drops in the cup. In the 
end, the audiences can check the cup, plastic leather, and coins.