Effect: A dime and a penny are displayed on a small metal coaster. The spectator selects one of the coins. One coin is removed from the coaster and the remaining coin is covered with an inverted clear drinking glass. The magician pushes the coin against the bottom of the glass and it instantly and visibly penetrates the solid glass bottom to join the other coin under the glass!
You must supply your own glass and coins. The supplied trick tray does the work for you.