study coin magic trick.

Effect: 

The magician shows a glass, upside down, and a coin on a sheet of colored paper. 

He puts a handkerchief over the glass and moves it over. 

He pulls the handkerchief off and Abracadabra! the coin has disappeared.

study card-trick 8 (magic).

Effect: The magician picks one person for the trick. The one person picks a card, remembers the card, and puts it back in the deck.  You search the deck and find the card.  Watch as the jaws drop.