For the same reason as any other.

Author: bobo32

Date: April 2, 2001

by bobo32
4-02-01
So, do you know what you get when you cross a donkey and a squirrel?
This isn't another bad pr0n comic, is it?
No, no, no... ummm....
Well, what DO you get if you cross a donkey and a squirrel?
Bill Gates!
That's the best punchline you could think of to cover your ass?