[Homer searches under the couch for a peanut]
Homer: Hmm...ow, pointy!
Eww, slimy.
Oh, moving!
Ah-ha! [looks, then says remorsefully] Oh, twenty
dollars...I wanted a peanut!
Homer's brain: Twenty dollars can buy many peanuts!
Homer: Explain how.
Homer's brain: Money can be exchanged for good and services.
-- The voice of reason, "Boy Scoutz 'N the Hood"