10 Types of People

Abstruse Goose is great!

Ok I think the "10 types of people" joke needs to become a latter day lightbulb festival of alternative jokes. Here are a few.

The first couple I did come up with but sadly also found variants of them online (see lists below).

There are 11 types of people in the world. Those who understand unary, and those who don't.

There are 10 types of people in the world. Those who understand binary, those who don't, and those who think this joke is about ternary.

Here is one from Chris Jefferson:

There are 10 types of people in the world, and each of them knows there are counting in base 10.

And if these are not geeky enough for you ...

Gurer ner 10 glcrf bs crbcyr va gur jbeyq. Gubfr jub haqrefgnaq rot13, naq gubfr jub qba'g.

There is 10 type of person in the world. Those who write numbers big endian.

There are 10 types of people in the world: those who like garden path sentences. 

There are IO types of people in the world. Those who like typing the moons of Jupiter in capitals, and those who don't.

There are 10 type's of people in the world: those who understand binary and those who dont care about it's base but are dialling the apostrophe police right now.

There are 10 typos of people in the world: those who understand binary and peploe.

And surely it's time for a mashup?

How many people does it take to change a lightbulb? 

10. One to change the lightbulb and one to make a joke about binary.

Here are some other collections of 10 types of people jokes: 

Straight Dope Message Board

There are 10 kinds of people... (extended edition!)