Effect

Folding coins have so many uses that it would be impossible to list them all. 

The most popular is the coin in the bottle. 

Magician magically places a coin inside a bottle being held by a spectator and then removes it and passes it around for examination.

 A real mind blower! 

There are many other uses for folding coins and a lot of books are available on the subject. 

Also available - half dollar profile, quarter.