The folding quarter is really a great trick and has been performed by many great magicians such as, David Blaine! The magician borrows a quarter from a bystander and a bottle and then shows that the coin is too big to fit inside the bottle. Then the magician magically makes the coin penetrate through the solid bottle! The audience can then examine the bottle with the quarter lodged inside. Upon demand by the magician, the coin comes out to be inspected. This trick is really cool and only takes a minute to perform! You can show the quarter inside of the bottle and shake it around if you want! The trick itself is so easy and can be performed by even a young amateur of 8 or 9 years of age. The trick requires minimal practice, but of course one has to have a folding coin in order to perform the trick!