The film popularized the "found footage" technique. It was so realistic that the director was arrested in Italy under the suspicion that he had actually murdered the actors on camera. He had to bring the actors to court to prove they were still alive.
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"Cannibal Holocaust" is a 1980 Italian horror film directed by Ruggero Deodato. The film is about a documentary crew that ventures into the Amazon rainforest to film a cannibal tribe but they are eventually killed and devoured by the tribe. The film popularized the "found footage" technique