(Strip Number 617, Original Publication Date, 26 May 1984)
Panel 1: As he and Elly look around the living room, John compliments her on clearing out the house.
Panel 2: That's because getting rid of all of their surplus possessions have given them more storage space.
Panel 3: He then asks her what she plans on doing with all the extra room.
Panel 4: She makes that stupid palms out gesture, smiles and says "Fill it with more junk!" Since he's an idiot who doesn't remember who he married, this astonishes him.
Summary: This is because Elly seems like she should probably be on one of those shows about compulsive hoarding.