(Strip Number 231, Original Publication Date, 22 February 1982)
Panel 1: We find ourselves in the Pattersons' kitchen watching Elly, who's got her eyes narrowed in rage as she yells "All right, Michael; hand over all those magnetic letters" at a pair of oven mitts; the reason she's doing so is that he's got the words "Mom is fat" spelled out on the fridge door, a crude drawing of a fat lady stuck next to it and a nasty smile on his face.
Summary: The reason he's doing this is that he's sort of a little shit; he knows that his mother thinks that she's fat as a pumpkin, knows it bothers her and, since he's a child and has an exaggeratedly high standard of physical perfection, honestly does seem to see her as being morbidly obese.