(Strip Number 663, Original Publication Date, 24 July 1984)
Panel 1: As they drive to the Richards house, Mike tells Jim and Marian that he isn't tired and doesn't want to lie down.
Panel 2: Mike, who doesn't want to be treated like a little kid or something, overestimates his ability to handle fatigue by saying that he's not at all tired.
Panel 3: Since she doesn't understand children at all well, Marian takes this at face value and asks him how his trip went, how Lizzie and and how things are at home.
Panel 4: Marian is mildly confused by the fact that Mike's jet lag kicks in just as she was about to get his take on what's up at the Pattermanse.
Summary: Aside from the glaringly stupid practice of having Mike sleep on the back seat and the glaringly stupid habit that Lynn and the Coffee Talkers have of saying that the only way they'd object to doing this is if they'd died doing it, there's another glaringly stupid thing going on her: glaringly stupid Marian being confused by all of this when she should smile ruefully about little boys who don't know their limits.