Crazy Glasses - Wonder
A crazy penetration effect where liquid penetrates solid plastic glasses.
Three separate empty clear tumblers are shown. You stack all three on top of one another. 

You have three smaller cups or bottles of soda with different colored liquids (not supplied) , say Purple, Yellow & Orange. You ask the audience what color liquid to they would like to start with. You tell them you will pour it into the tumbler of their choice  (top, middle or bottom). Let's say they say orange in the bottom one. You pour orange into the top tumbler and the liquid passes through the top tumbler and fills the bottom tumbler.