I couldn't think of it. So I shrugged and shut the freezer and started walking to my room to get my keys. While I was walking I began to whistle. When I got to my room, I exchanged whistling for singing. The lyrics ran like so: "No more pie now ... No more Creme Brulee ... Lay of the gravy ... And souflee ..."
It was Weird Al's "Grapefruit Diet", to the tune of "Zoot Suit Riot".
I had just failed to remember a reference ... and then spontaneously started using that reference, as though I'd actually remembered it.