A couple of limericks from a fantabulous book I have, cited below. The first is about the mathematician, whose name is pronounced "air-dish," who is the subject of the book. There is more info about said legend and this limerick here.

A conjecture both deep and profound
Is whether the circle is round.
In a paper of Erdös,
written in Kurdish,
a counterexample is found.

A graduate student at Trinity
Computed the square of infinity.
But it gave him the fidgits (sic)
to put down the digits,
so he dropped math and took up divinity.

And finally, to reward your having read this far and also to complete this odd little segue from math to religion, two special bonus limericks!

There was a man who said, "God,"
It has always struck me as odd
that the sycamore tree
simply ceases to be
when there's no one about in the quad."

"Dear Sir, Your astonishment's odd;
I am always about in the quad:
And that's why the tree
will continue to be,
since observed by
Yours faithfully, God.

All limericks from
Hoffman, Paul. The Man Who Loved Only Numbers. Hyperion: New York, 1998.