Because they always work problems out with a pencil.
The same way he solved all other problems: He worked it out with a pencil and paper.
Because he is an erascist.
They only work 10% of the time.
Ah-so-late!
Do you know the problem with UDP jokes?
He worked it out with a pencil.
He works it out with a pencil.
Sin Pi
Because they are always multiplying.