Right after Fonzie "Jumped The Shark", Happy Days went down hill & was canceled.
Here:
Jump the shark or jumping the shark is a term originally used as a metaphor for when a television series has passed its sell-by date. The term originated after an episode of the hit television series Happy Days. In one episode, Arthur Fonzarelli, otherwise known as The Fonz, literally water skis over a shark. It was at this point that viewers became disenchanted with the show and its days were numbered.
Really hope this thread is around alot longer...