(Strip Number 7158, Original Publication Date, 6 May 1984)
Panel 1: We start things off with Elly telling everyone that dinner is ready.
Panel 2: She then thought-bubbles that you've gotta worry when the dog is the only one to show up right away.
Panel 3: As John walks into the dining room, he's taken aback when Elly tells Lizzie "Sit down, Elizabeth! And if you don't eat, there'll be no dessert."
Panel 4: John tells Elly that what she's doing is using dessert as a reward.
Panel 5: Elly rolls her eyes in irritation when John tells her that conditioning them like that can lead to all kinds of bad habits later in life.
Panel 6: He further irritates her by telling her that dessert should not be the sole reason for eating a meal.
Panel 7: Elly tells him that they're having liver with spinach and creamed squash.
Panel 8: John looks at the unappetizing, heartburn inducing pile of regrettable food on his plate and despairs.
Panel 9: Instead of asking Elly if she's related to Magneto (because that's the only way her fork would stick to her pinky finger the way it does in the strip), John meekly asks her what's for dessert.
Summary: John is meant to be a hypocritical idiot here but, well, Straw Train-man Has A Point. Not that it's a point Lynn will acknowledge. She's too busy talking about how she plowed through Mommy's gastroanomalies to get to dessert to realize that she has been conditioned and has picked up craptacular eating habits.