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The one that inspired this tweet: a passenger left alone in a car while driver goes into a store will discover a secret in the glove compartment. It’s not really a trope but a shot clue: if they show the left behind person rather than follow the other character there’s a reason.
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An annoying one: in a detective show, a recognizable character actor showing up in an early scene in a minor role with unnecessary lines is probably the murderer. You don’t need to know the plot to guess that they wouldn’t use a speaking role established actor as an extra.
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I guess these aren’t tropes so much as subtropes. I think I’ve mentioned the second example before in some thread.
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Right? Using info from outside the tv show universe to make predictions about the in-show universe. Reminds me of how some AI will find a way to use clues from outside a system to act optimally within it. Always unintended.