math jokes

so I probibly just failed my math final, which isnt so bad because I did well enough on the previous two tests that I probibly won't fail the class reguardless.  still, I could use some cheering up, so post your best math jokes.  I'll start.

what do you get when you divide your parrot?
polygon.

>>15
That's just the magnitude of elephantxrabbit.
The resultant is a vector that can't be described in just one expression.