I guess I need to explain what jump the shark means...I thought it was kinda common knowledge, but just in case....
it means when something that used to be good has reached a point where it's tired and/or lame. The phrase comes from the 70s TV show "Happy Days." When Happy Days first came on, it was kind of a cool show, with really decent writing and acting and storylines that reflected what a family in the 50s was like.
However, over time, the writers began to run out of ideas, but the cultural phenomenon of the show was still there...Fonzie was "cool" and all of that...and even though the episodes began to decline, the show still had some cache; that is, until one day, they wrote an episode that had Fonzie waterskiiing with his leather jacket on, and jumping on water skis over an area of water that had a shark in it.
It was at that moment that you knew that Happy Days had turned a corner and was never going to be as good as it used to be. It was now lame. The show had "jumped the shark."
http://en.wikipedia.org/wiki/Jumping_the_shark
http://www.tvguide.com/jumptheshark
I really thought that this phrase was well known....