Plot Said So

''We don't need a real reason for that—the plot said so! END OF STORY.''

If something that can't be explained by characters without taking an atrocious amount of time, thus killing the story's momentum, happens, that can all be summed up with three short words: Plot Said So.

Moments of this nature are usually found whenever a plot hole needs to be filled with some meaningful substance, but can't be due to such a substance being absent. So if characters can't explain it, the writers can't come up with any witty way to explain it without directly doing so, surely the plot itself and what happened earlier in it could provide enough explanation to the audience who desperately needs it, right?

"Plot Said So" can also refer to when something formulaic happens due to how clichéd or commonly used it is in (other) forms of fiction and needs no further explanation as you already know what's happening and why. This is UnTrash Wiki's response to many moments that may be thought of as such.