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When I chanced upon JTS years ago, it was hilarious to note this: Ted McGinley is a category by himself! Recall him from 'Revenge of the Nerds' - the leader of the jocks? The patron saint of shark-jumping - apparently, any show experiences a fall in ratings after Ted shows up on it, leading to its eventual cancellation.
Jump the Shark: 'In a television show, to include an over-the-top scene or plot twist that is indicative either of an irreversible decline in the show's quality or of a desperate bid to stem the show's declining ratings. '