Daniel R. Budnik writes:
So, if Fonz jumping the shark is a “jump the shark” moment, then five episodes later, with the introduction of Leather and a very good two-part story, it righted its own errors. I don’t know if there is as ubiquitous a term for this—“Polishing the Leather?” “Singing with Quatro?” Or, perhaps most fittingly given the show in question, “Punching the Jukebox”?