To moderate the drinking of workers during water supply works in the Aegean island of Samos, Pythagoras invented the brilliant “fair cup.” If the drinker was too greedy and poured over the limit, a siphoning effect would cause the cup to drain out its entire content. It was built to hold just the optimal quantity of wine.
The “puzzle jug” is a similar device, a pitcher with holes all around its neck. A puzzle in the shape of a pitcher, it challenged the drinker to drink from it without spilling the liquid. Typically, it had a short verse inscribed on it.
This one, a Doulton Lambeth jug, carries:
Here gentlemen, come try your skill,
I’ll hold a wager if you will.
That you don’t drink this liquor all,
Without you spill or let some fall.