10 Kinds of People in the World
There are 10 kinds of people in the world — those who understand binary and those who don't.
There are 10 kinds of people in the world — those who understand trinary, those who don't understand trinary and those who mistake it for binary.
The first joke was submitted to the GNU Project by Colin Sharpe in 2004, and the second by François Celliers in 2008.