On today's edition of Nonsociety (the Julia Allison files):

Me: Paris Hilton broke up with that ugly guy.
Mary: Great.
Me: Do you think she's jumped the shark?
Mary: What does that mean?
Megan: It refers to the defining moment when a television show goes from being good to sucking, derived from Happy Days, when Fonzie literally jumps the shark.
Mary: Wow. How do you know that?
Megan: How do you NOT know that?

And there you have it folks. Substantial evidence for why I can't stop reading NonSociety.  I hope this helps explain the obssesion a little bit, if not there's always the photos.  You can't "jump the shark" if you don't know what that means right?