I bet you thought I'd say habeas corpus

I don't know if this happens to other people, but I can't recall it happening to me: I had a song stuck in my head, and then realized that no such song had ever been recorded. In particular, the song was a hybrid of Fleetwood Mac's "The Chain" and CCR's "Who'll Stop the Rain?" The chorus went, "I can still hear you saying/ You can never stop the rain."