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"The Blair Witch Project"

One of the most profitable movies ever made is 1999's "The Blair Witch Project," which had a production budget of $60,000 and a worldwide box office take of over $248 million, according to Box Office Mojo. The film was a fictional account of three film students' experience investigating a centuries-old tale about a witch.

"The film was intended to be a fake documentary," co-director Daniel Myrick told Entertainment Weekly. The movie was publicized a year in advance by its website, which featured faked police reports and staged interviews with ornery townsfolk. The advance publicity fueled a widespread public perception and confusion that the film was comprised of real footage, which only led both horror fans and curiosity-seekers to purchase tickets in droves.

Source: blairwitch.com