Evil Ed

Evil Ed is a 1995 Swedish horror comedy film directed, co-written, edited and shot by Anders Jacobsson and starring Johan Rudebeck, Per Löfberg and Olof Rhodin. The film's plot follows the ordinary peaceful film editor Edward Tor Swenson, who is transferred to a movie company's horror department after the last employee went insane, and as he has to watch and edit gory movie scenes, Ed goes insane, and embark on a murder spree.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

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