Fuddling cup
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Fuddling cups are a puzzle. The puzzle comprises three or more cups or jugs linked together by holes and tubes. Being joined, it is seemingly impossible for a drinker to sup from one cup without spilling the contents of the others.
The solution to the puzzle is either to suck up the contents while leaving the fuddling cup perfectly still on a horizontal surface, or, at least in some cases, to drink from the cups in a certain specified order.