Earlier quoted context omitted.
My favorite on this vein is: "There are 10 types of people in the world: those who understand binary and those who don't."
I like this variation: There are 10 type of people in the world: Those who understand binary Those who don't And those who count from zero
There are 10 types of people in the world: those who understand binary, those who don't, and those who didn't expect this joke to be in base three.