(Strip Number 1305, Original Publication Date, 20 June 1988)
Panel 1: We start things off with John just plain waling away at the cupboard with his hammer.
Panel 2: Mike marvels at how readily it came down.
Panel 3: John acts like a good little caveman and hoots about how he didn't know how GOOD it would feel to physically tear something apart.
Panel 4: This causes Mike to caution Lizzie against copping to dumping milk in his briefcase.
Summary: My guess is that if we're told anything, we're going to be told that we're supposed to ignore the disturbing image of John beating the billy-hell out of Lizzie for a klutz attack.