Overflow.
kitten   September 28, 2009

It is recorded that Master kitten received a Windows priest who came to inquire about Unix. Presently, kitten served tea. He poured until his visitor's cup was full, then continued pouring. The Windows priest watched the overflow until he could no longer restrain himself: "It is full! No more will go in!" he exclaimed.

"Like this cup," said kitten, "you are full of your own opinions and methods. How can I show you Unix unless you first empty your cup?"