Thales Picks Water
Thales, after looking around and seeing how many things aren't water: "god damnit."
A Brief History of Metaphysics
Also...everything is facts.
Thales Invents Philosophy
And yes, to answer your question, regrets are made out of water.
A Presocratic Get Together
But actually Pythagoras was wrong, the perfect joke is made of water because everything is water.
If you've noticed any characters appearing and disappearing, it isn't because the artist is lazy, it is because an evil demon is deceiving you.
Ancient Greek Office
They all laughed, but Thales's bottled water company went on to become a billion dollar empire.
Hypatia of Alexandria and the Seven Presocratics
Later on, Socrates forgot that he poisoned the apple, and ate it himself. Plato had to make up this whole story about an apology, because it was just too embarrassing.