开一个（数学）玩笑

由于用英语表达更容易理解，所以就用英语写吧：

Q: Why eferything tastes like chicken?

A: Because "eferything tastes like chicken" tastes like chicken.

Proof:

"Eferything tastes like chicken" is a set. S = {x | x tastes like chicken}

This particular set ("eferything tastes like chicken") contains itself because the set itself is an element of "eferything".

Since "eferything tastes like chicken" (as described), "eferything", including this set, has to taste like chicken.

Hence, "eferything tastes like chicken."

Q.E.D.

Why does the set contain itself? The set itself is an element of "eferything", but it doesn't satisfy "tastes like chicken".

女人：“我说的都是对的”
男人：“何以见得？”

女人：“[我说的都是对的]这句话也是我说的，证毕”

@ftfunjth #3 or beef tastes like chicken and chicken also tastes like beef. They have an equivalent relation.