Coin through Glass (VDF)

The magician shows the audience a small plate and puts a 2 euro coin on it. He then introduces a solid transparent glass and places it mouth downwards over the coin on the plate. Now with a 5 cent coin he starts to tap the bottom of the glass and suddenly the audience will see the coin "penetrate" the bottom of the glass and drop near the 2 euro coin on the plate. A wonderful effect easy and visual! Glass is not supplied.