Jumping the shark is an idiom used to denote the point in a television program's history where the plot spins off into absurd storylines or unlikely characterizations. These changes were often the result of efforts to revive interest in a show whose audience had begun to decline.- http://en.wikipedia.org/wiki/Jumping_the_shark
So many times in history this has happened to a lot of our favorite shows so i pose this question; when did your favorite show or manga jump the shark and started to decline? When did you throw your hands up and say "that's it!! I'm done!"
Yu Yu Hakisho showed me it in the manga when <REDACTED> found out his dad was a demon or some crap like that.
I am willing to debate that DBZ jumped the shark after the cell saga.