I just crafted an analogy for you there.
You see, we already have an expression for the moment when a once brilliant TV franchise turns sour. It's called "jumping the shark" and it can be traced back to a moment in Happy Days when the Fonz (Henry Winkler) literally jumps over a shark.
However, movies didn't have a similar term. Until now, that is.
Rumor has it that some Indiana Jones fans were so upset with that scene near the beginning of the film (you know, where Indy protects himself from a nuclear blast by climbing into a lead-lined fridge, which is then thrown like a gazillion feet, though Indy manages to exit scrape free) that they have crafted this term..."nuking the fridge."
It's like jumping the shark, but for a film franchise.
The rest, I guess, is up to you...
Can you think of other movies (and at what point) that have nuked the fridge? Spider-Man 3, perhaps...?