Show a nice looking hollow coin tube, three 20 cents coins and a 2 Euro coin. The coin tube is pulled apart in two pieces. A 2 Euro coin (can be borrowed) is inserted in the space provided inside the tube pieces and closed. There is no way anything can pass through the 2  Euro coin. Drop the 20 cents coins from top of the coin tube and they fall freely on the table one at a time magically penetrating the Euro coin which is imprisoned in between the tube obstructing the passage.
- The wooden tube is cm 8,2 high and the middle part has a diameter of cm 4,2.