Quotes that divide humanity into two groups

The world is a tragedy to those who feel, but a comedy to those who think.
-Horace Walpole, English author (1717 - 1797)

The English-speaking world is divided into those who have read The Lord of the Rings and The Hobbit and those who are going to read them.
-The Sunday Times

There are 10 types of people in the world... those who understand binary and those who don't.

There are three kinds of people in the world, those who can count and those who can't.

There are two kinds of people in the world: those who divide the world into two kinds of people and those who don't.