Heh. Perhaps "Jumping the Shark" should have been defined at the start of the thread.
According to Mr. Google, it refers to when a TV series or movie reach a point at which far-fetched events are included merely for the sake of novelty, indicative of a decline in quality.
I take that as, the Happy Days writers ran out of ideas and did some whacky shit out of desperation to boost ratings, but the decline was inevitable. In hindsight, the last ditch effort is now seen like a bad toupee or combover.
Applying that sentiment to the career of U2, I'd bet the majority of this forum would consider the space between POP and ATYCLB as the shark tank, and 4 Fonzies got in a 40 ft. lemon on water ski's, cleared the tank with plenty of Elevation and landed smoothly in some Wild Honey.