Have you ever seen a quarter do this?
 
With Funnel Vision you will! The lid is opened to show the inside of the case. Real quarters are inserted into the top of the funnel. When they drop out, they have shrunken. The case is turned over, and the tiny quarters are dropped inside. Suddenly, they become a full-sized half dollar!

Comes with 5 miniature metal quarters (you must supply real Quarters and Half Dollar).