Hurrah, new thread! But as I say in the first post, no xkcd. Partly because it's too easy to make Randall Munroe do all the hard work for you but mainly because I've seen them all already.
:
There are 10 types of people in the world.
Those who understand binary and those who don't.
And the terrible thing is that I initially wrote '2' because that's the way it was stored in my memory. I think my brain might be a digital system.