Passing the Plate: Darwin Edition

Brothers, sisters, and Transgendered Comedists Everywhere,

It's that time again. Time to dig deep and be generous. When other religions ask for donations it is always money, but us Comedists ask that you tithe jokes. In honor of the anniversary of Darwin's birth on Monday, this go 'round is "What do you get when you cross..." jokes:

What do you get when you cross a Jehova's Witness with an atheist?
Someone who knocks on your door, but has nothing to say.

What do you get when you cross a chicken with a duck?
A bird that lays down.

What do you get when you cross a turtle with a snail?
norm(turtle) norm(snail) sin theta. (That's a Cartesian product joke for the non-math geeks out there)

What do you get when you cross a sheep with a cicada?
Baa Humbug!

Lastly, my personal favorite:

What do you get when you cross an elephant with a rhino?
Elephino.

Contributions out there fellow Comedists?

Live, love, and laugh

Irreverend Steve