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Jumping the shark

Look up jump the shark in Wiktionary, the free dictionary.

Fonzie on water skis, in a scene from the Happy Days episode "Hollywood, Part Three of Three," after literally jumping over a shark

Jumping the shark is an idiom, first employed to describe a moment in the evolution of a television show when it begins a decline in quality that is beyond recovery.
In its initial usage, it referred to the point in a television program's history where viewers feel "the writers have run out of ideas" and that "the series has [lost] what made it attractive."^[1] These changes were often the result of efforts to revive interest in a show whose audience had begun to decline.^{[2] [3]}
The usage of "jump the shark" has subsequently broadened beyond television, indicating the moment in its evolution, characterized by absurdity, when a brand, design, or creative effort moves beyond the essential qualities that initially defined its success, beyond relevance or recovery.