a jump of sorts

I was alerted to a great phrase the other day.

"Jump the shark"

to be used in reference to the instant when something has reached it's peak, and is on it's way (WAY) downhill.

Apparently it all got started by some guys who were sitting around talking about their favorite TV shows. One that came up was "Happy Days". And at which eposode was it realized to be the beginning of the end? The eposode where-in the Fonze is out water skiiing in his leather jacket and he has to jump the shark....
ah ha...

What things in my life have jumped the shark? Is it possible to un-jump?
just something to think about.