(Strip umber 1012, Original Publication Date, 31 January 1986)
Panel 1: We find John telling Lizzie that he's putting plastic over the hole in the ceiling of her room.
Panel 2: He then tells her that a contractor will be over to fix it tomorrow.
Panel 3: Jerkass Michael scares Lizzie by telling her that there's nothing to stop the bogeymen from coming down from the attic. (Note: Lynn spells it boogie men because she doesn't know how to spell the word.)
Panel 4: When John overhears this, he tells a freaked-out Michael that he's just volunteered to switch rooms.
Summary: Since Mike wasted his childhood looking for proof that yes, his parents never really loved him and yes, Lizzie was actively trying to destroy him from Day One, I should think that his panic is alleviated by validation.