This is the opposite of jump the shark. When a good show becomes a great show, it has crashed the fence. This phrase comes from season one of the FX show "The Shield" in which series star Michael Chiklis' character Vic Mackey crashes through a fence rather than climbing over it while chasing a criminal.
"Did you see Avatar last night? It crashed the fence when Ang learned how to water bend."
by Brad Ellis January 04, 2006