Boy Scoutz has lots of great quotes:
Marge: Homer, I have to go out and pick up something for dinner.
Homer: Steak?
Marge: Money's too tight for steak.
Homer: Steak?
Marge: Er...sure...steak...
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Homer: So how was jerk practice, boy? Did they teach you how to sing to trees, or build crappy furniture out of useless wooden logs? (Homer's chair breaks) D'oh! Stupid poetic justice!
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Homer: Well, if it isn't the leader of the wiener patrol, boning up on his nerd lessons. (sings) Egghead likes his booky-books!
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Homer: Shut up, brain, or I'll stab you with a Q-tip!
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Homer: Mmmmm...free goo!
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Bart: Actually, we were just planning the father-son river rafting trip.
Homer: Heh heh heh. You don't have a son!
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Bart: You did it, dad! You saved us!
Homer: Go away...eating!
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Homer: 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 goods and services.
Homer: Woo-hoo!