Dirt Cookies

Jerry: We made cookies in Biology yesterday.

Ben: Where?

Jerry: In the lab.

Ben: Isn't it dirty in there?

Jerry: The dirt gives it protein! Plenty of brain food.

Ben: You need plenty.

Jerry: Is number 2 negative?

Ben: I'm not doing that!

Jerry: Yes you are.

Ben: You need to eat more of those dirt cookies!

Jerry: Is this negative?

Ben: NO!