Two brass rings and a brass plug are handed out for examination, as well as four quarters. The brass plug is sandwiched between the two brass rings, and the four quarters are dropped in the top. One at a time, with no funny moves, the quarters penetrate through the brass plug and fall out the bottom. At the end of the routine, everything can again be examined.
Easy to do, no sleight of hand. A fantastic trick for beginners and pros alike.