Civilised Glass

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Also known as the Pythagorean cup. Fill the wine glass up beyond a certain point and and the whole glass will quickly empty itself. A sure fire way to guarantee that no one overfills their glass!

So long as the drinker follow the etiquette and pour the wine below the hump, they can drink away with no problems. 

It's about the same principal of sucking the end of a tube and the fluid continues to flow.