Dropping a coin into an empty glass.
An empty water glass.
A credit card.
A large coin (a quarter will work).
Set up the glass on a table and place the credit card on top of the water
glass. Put the coin in the center of the credit card and place the quarter
in the center of the card.
The object is to drop the coin into the glass by touching only the credit
card. To do this use your thumb and forefinger to quickly flick the
card out of the way. Here the mass of the coin causes it to resist
very quick motions so it will not move while the lighter card is moved out
from under it.
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