When you're writing a script, sometimes you resort to a plot device
that's totally implausible but necessary to the story –- a coincidental
meeting of your two main characters, for instance, or, maybe, the only
way you can free your hero from certain death is with a freak,
unexpected earthquake that jolts the steamroller that's about to hit
him -– c'mon, we've all done it. We've all resorted to these kinds of
tricks, told ourselves, "hey, look, it's a buy, okay?" or "it's way
deep in the third act, at this point, the audience wants an earthquake
to happen," or, "it's happens on page six! It's a romantic comedy! The
audience expects a certain amount of fanciful whimsy…"