Vanishing Coin in Glass

Simply borrow a quarter, and place it under any piece of cloth- a silk scarf, a bandanna, even a dinner napkin.

Let your spectator hold on to the coin through the cloth.
He can absolutely feel the coin between his fingers!
Next, take a small plastic glass full of water, and hold the glass underneath the coin.
At your signal, have the spectator let go of the coin.
It can be heard dropping into the glass of liquid.
But when you take the cloth away- the coin is nowhere to be seen!
The glass is still full of water- but WHERE IS THE QUARTER??
You can even pour the water out of the glass, leaving the glass empty- no quarter!

The coin can either disappear forever, or you can use another trick, like the Magic match boxes to make the coin reappear again.

You can make a complete routine out of the two tricks.