Most people love the idea that something is potentially "based on a true story" — that's the entire hook of found footage. The buzz around Blair Witch was due in part to the guerrilla marketing the movie's team had in place prior to its release, but it was the legend of the titular Blair Witch and the idea that people actually went missing that drew everyone in. Blurring the lines of fact and fiction has also worked for found-footage films like Paranormal Activity, [REC], and to a lesser extent, The Gallows.