Let's get physical

Have you seen the glass of water and index card trick? If not, check it out:
https://www.youtube.com/watch?v=RnpPiuv4c2U
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Now, do that with one glass, and then fill a second glass normally (right side up). Stack the two (with the index card in between). Then slide the card out! Bam! Science!

It provide proof for funstats' point, there is an index card in the background with some water on it.

Oh god I thought it was alcohol

See funstats.