Using an empty beer bottle, place a crisp dollar bill, with George Washington's face centered over the opening, on top of the bottle. Next, place three quarters on top of the bill, right over the center, George's face.

Ask your customer if he can remove the dollar without touching the quarters.

It takes a bit of practice... but if the bartender licks his fingers and then smacks the dollar bill very near to the bottles edge, as hard as possible, the dollar will snap right out.

It's a real ooooh-and-aaaah trick for bartenders that's super-easy with a bit of practice.