The institute of unfinished research has concluded that 6 out of 10 people...

[Enter stage left]

[boonecreek]

1. Are six out of ten people?

After all, it's only logical.

[Stardust Mirror]

2. There are 2 kinds of people:

Those that can make conclusions based on incomplete data

[Rincewind]

4. There are 10 types of people:

those who understand binary, and those who don't.

[Permanut]

3. The institute of unfinished research is just down the hall from the Department of Redundancy Department.

[Wounded Bear]

5. There are two kinds of people...

Those who think there are only two kinds of people, and those that don't.