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Characters in movies don’t know they are in a piece of projected fiction. This is often portrayed as “genre blindness,” where a particular genre of movies is never referenced in the story directly. This is often the case with zombie movies.
If you were trapped in a movie, a character in a piece of cinematic fiction, how could you tell?
Well, for one thing, parking would be a lot easier. Wherever you go, to a friend’s house, to a shop, or anywhere really, there will be a parking spot not only close by but very likely right in front of the place you are hurrying to. This is especially true in massive cities with crowded streets. No one in a movie set in San Francisco bats an eye at the magical parking available to them.
Another way to know that your actions are being played for someone else’s entertainment is through the radio and television news. When you turn on these devices, not only will the news be playing, but the story will have direct and important relevance to your particular situation. You will not have to wade through minutes of side stories, political posturing, or sports results to get to the vital piece of information that you didn’t know you required.