In some cases, horror films have used the tagline "based on true events," but the story remains as fictional as ever. It's a marketing ploy, and curious viewers prove that it works. Research is optional, and audiences tend to believe that the horror effect is potentially more significant. When it comes to found footage films, most of them run on this idea. In some cases, it's the only way they can function from a narrative point of view. But does this mean they're always realistic, aside from the prominent feature of being shot like something factual?

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