What's the difference between this and Godzilla Threshold? I don't see why they're two separate tropes.
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Indeed, Godzilla Treshold's film example even feature Ghostbuster's Crossing the Streams.
The difference is that Godzilla Threshold refers to the moment, not necessarily the solution. This trope refers to a solution that is mentioned earlier in the work and is expressly forbidden. The solution to a Godzilla Threshold doesn't necessarily have to be this trope, as the solution might be standard procedure in such an event rather than something forbidden. Also, the solution to a Godzilla Threshold doesn't necessarily even have to be brought up earlier in the work. It can simply appear as the plot demands it. This trope specifically requires some kind of setup earlier in the work.
For a good example of Godzilla Threshold that's not this trope, see Terror of Mechagodzilla (I guess that's why Godzilla is the trope namer, he does this quite a bit). The threshold gets crossed twice in that film, and both times Godzilla instantly appears right on cue to save the day. We don't even get any shots of him swimming to Japan to let us know he's coming. He just shows up when the plot needs him.
Edited by Fnu
I think there's a subtrope of this that is kind of a variant of Heroic Sacrifice. That is, the characters don't take a Million To One Chance that it will succeed, one specific character does something that is certain to kill them but will also achieve the goal; the similarity comes in that the 'something' is a previously discussed never-do-it. An example would be going up to the Big Bad and stuffing a portable hole into a bag of holding. Any information on this?
Exactly how different are this and Inevitably Broken Rule? They seem so similar, and many work examples could fit into either. It feels weird to separate them when they'd be better merged.
"Squid has to go to market. He's had to go to market for as long as he's sucked water."