You will need:
An empty drinks cup with a lid and a straw.
A sharp pencil or something similar.
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First take your empty cup and place upside down. Now roughly mark the centre of the base with your pencil or sharp object. When you have done this peirce the hole you have just marked to about the same size as the diameter of the drinking straw.
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Also, if you picked up a cup of liquid and tried the straw and got nothing but air, aren't you going to suspect something? This is a funny idea, but I'm just not seeing it actually working on anyone you'd want it to work on.
For even more trickiness, keep some of the drink in the straw before you seal it, then squirt some ketchup in it! Bleck, runny soda ketchup!
A prank I like to pull on friends is to tie the straw in knot and put the knotted end into the liquid. When they suck on the straw they get nothing.