THE DIME IN THE GLASS
Submerge two high ball glasses in water so that they fill and place them top to top, with the water in them in front of you.
The Wager: That you can place a dime into the bottom glass without spilling a drop.
The Secret: This one is pretty easy. Take a spoon or knife (provided it's metal) and tap the side of the upper glass until it moves just enough to slip the edge of a dime between the two glasses. Then you gently tap the dime until it falls into the glass. The surface tension of the water will keep it from spilling.