Pythagorean cup
PRACTICAL JOKE DEVICE
Pythagoras cup; Justice cup; Cup of Tantalus; Greedy cup; Greedy Cup
A Pythagorean cup (also known as a Pythagoras cup, Greedy Cup, Cup of Justice, Tantalus cup or i koupa tis dikaiosynis) is a practical joke device in a form of a drinking cup, credited to Pythagoras of Samos. When it is filled beyond a certain point, a siphoning effect causes the cup to drain its entire contents through the base.