My favorite on this vein is: "There are 10 types of people in the world: those who understand binary and those who don't."
There are 10 type of people in the world:
Those who understand binary
Those who don't
And those who count from zeroThere 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.