I expect John remembers this exchange from the episode “Lisa the Vegetarian”:
Homer: Wait a minute wait a minute wait a minute. Lisa honey, are you saying you’re never going to eat any animal again? What about bacon?
Lisa: No.
Homer: Ham?
Lisa: No.
Homer: Pork chops?
Lisa: Dad! Those all come from the same animal!
Homer: [Chuckles] Yeah, right Lisa. A wonderful, magical animal.
