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I still don’t understand what is the purpose of having such a cup, wouldn’t it just waste the water or used to limit the amount of water? Anyone could help me,

• lcuff 8y ago
  I'm gonna say "for the fun of it" and "use for practical jokes" (choose your victim and context carefully!
• tejtm 8y ago
  Science! pleasure can be found in something behaving in an unexpected manner. for example, a cup that empties itself without overflowing the brim, but only if you fill it beyond a certain point.
• willchang 8y ago
  Toilets work the same way! When water in the bowl rises to above the highest point in the drain, everything (hopefully) siphons out.
• andrewflnr 8y ago
  It's pretty much entirely a cool trick and a joke. It was framed as a social commentary on gluttony, but I doubt that was ever the real reason for it or taken seriously in any way. It's just a cool thingy.