Chalkboard: None

Couch: The Simpsons run in and find that the couch is missing (like in the couch gag for season two's "Itchy & Scratchy & Marge"), but this time, the couch falls from the sky and crushes the family.

Ralph: Duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck ...
(Fast forward to hours later, where everyone clearly frustrated and/or asleep. Ralph is still choosing ducks and still full of energy.)
Ralph: Duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck ..."

Bart (finally snaps): Say goose, you stupid freak!" Which causes Ralph to run out of the room crying.

Millhouse (on speakerphone): Hello? Hello? I had to leave because my french bread pizza dinged. Hello?

Ralph (returning to the now-vacant living room and patting the furniture, as though the items were people): Duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck, duck ..." (30 times at least)

Nelson: Hot dogs are awesome!
Marge: You've never had one?
Nelson: No, but I saw them in a catalogue once.

This episode's title is a direct allusion to “Sleeping With the Enemy” the 1987 novel written by Nancy Price. It was later adapted into a 1991 film starring Julia Roberts & Patrick Bergin.