It works. I saw some people who, after particularly terrible service at a restaurant, put some change in a full cup as a tip, flipped it over with the paper on top, then set it on the table and removed the paper. To get the tip the waitress would have had to pick up the cup and spill the water.

Nasty but effective.

I'll wait for the mythbusters take on this. Which will be soon, since I'm guessing they'll be grounded for a couple of months after that cannon ball thingy.

The first part where the paper keeps the water in is true, provided no air can enter the glass the water can't fall out.

The second part where the water stays in after the paper is removed is fake, normally achieved by a transparent plastic disc (the size of the mouth of the glass) being lifted into place at the same time as the paper.

HA HA! Damaged lappy!

*dead

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