There is no fun in being an expert in physics if you can’t screw with people sometimes. This Cup of Tantalus looks a little odd with the question mark shaped protuberance in it, but no one is going to guess what kind of mess it will make. Once you get the glass filled to a certain point the liquid will begin siphoning out of the bottom. The pourer will have no clue what is going on other than knowing there is red wine pouring all over his carpet. If you get any complaints, just tell them you were trying to educate them on a little physics.
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