Happy Days: Jumps The Shark

30 Years ago on September 20, 1977 Arthur Fonzarelli in his leather jacket went water skiing and jumped the shark.

What is “jumping the shark“?

It’s a moment. A defining point in a television program or series of any type.
The instant you know that from now on it is all down hill. The climax you might say or in this case the moment the original premise is so lost, so off course that there is no point in going on.

30 Years ago Happy Days produced in it’s decline a pop culture idiom.