"Happy Days," "Hollywood Part 3"

It's vacation time in Season 5 when the Wisconsin-based characters head to Hollywood: Fonzie has a screen test in the hope of becoming the next James Dean. A local, "California Kid," challenges Fonzie to a ski-off; Fonzie water skis a slalom course (in shorts and his ubiquitous leather jacket), ending with a jump over one of the only things he fears, a shark. And just like that, an idiom was born.  To be fair, the episode had more than 30 million viewers, and the series continued for six more seasons, so if that jumped shark was the beginning of the end, viewers didn't seem to know it at the time. When a show starts its inevitable downhill slide, it's generally dubbed "jumping the shark," but might better be called "introducing a Cousin Oliver." 

Bing: More about 'Happy Days'

(CBS)i