You know it just doesnt make sense..."Jump the shark".
It sounds like something George Costanza would say...kinda like "Jerkstore". You cant "jump" something when you're already in the water [where you'd need to be in order to actually "jump" over a shark]...it just does not make sense.
Besides...it's a cheesy media driven saying. Let it go.
LOL!!! You beat me to it.
For me, O'Reilly's show "jumped the shark" when he interviewed Swifty Steve Gardner.