My favorite episode is the New York one, when Homer's car has the boot on the tire.
"What do you have to drink?"
"Mountain Dew or Clam Juice."
"Ughhhhhhhhhhhh GROSS! I'll take a Clam Juice."
Too bad they don't air that in light of 9/11. I liked that episode a lot too.
My favorite is still the Lisa the Vegetarian episode:
"It's just a little slimy, it's still good, it's still good!"
"You don't make friends with salad!"