1. Martyrs (2008)
This is a psychological horror drama that's been classified as part of the New French Extremity movement which — to give you an idea of what it's about— is the near-unwatchable film genre where you can find movies such as Gaspar Noé's Irreversible, which the film critic Roger Ebert described as something so violent that it's almost unwatchable.
As for Martyrs, it's a story of revenge focusing on two girls who were victims of abuse as kids. Hollywood remade it in 2015, but the French version is more critically acclaimed.
2. A Serbian Film (2010)
As the name implies, this is a Serbian movie. It follows the story of a porn actor struggling with financial problems. In order to provide for his family, he's pressured into accepting what becomes the worst job of his life — involving, unbeknownst to him, necrophilia, rape and child abuse. The movie has been banned in several countries due to its raw graphical content.
3. Nekromantik (1987)
This German movie has been classified as an exploitation film and deals with subjects like necrophilia, animal abuse, and a very twisted eroticism. Tl;dr, a couple shares a sexual attraction towards corpses and have sex with them. However, things manage to get EVEN MORE twisted as the movie progresses, somehow...
4. Atroz (2015)
This film has been called "the most violent Mexican movie ever made" (link in Spanish), and it tells the story of two men who are involved in a traffic accident and get arrested. That's when, inside the car, the police find a video camera with a series of videos depicting murders so gruesome that only a seriously sick mind could have carried them out. The film has lots of hand-held camera scenes and shots so (purposefully) shaky that they'll have you on the edge of your seat.
5. Excision (2012)
The main character of this film is a very lonely schoolgirl with a pretty twisted mind. She dreams of studying medicine while she's looking for ways to make her domineering mother feel proud of her. Even though this teen has a serious obsession with sex and surgical procedures, the way in which the movie is told reminds you of just about every other teen drama — just, uh, taken to the extreme on the violence end.
6. The Human Centipede 1, 2 and 3 (2009, 2011 and 2015)
In the original film, a German doctor kidnaps three tourists and binds them together using surgery, sewing one's mouth to the other's anus, with the goal of creating a human centipede where humans share the same digestive system.
That first film became a sort of franchise: the second movie tells the story of a fan who decides to copy what he saw in the first movie — only with 10 people — and the third one takes place in a prison and links 500 people.
7. Salò, or the 120 Days Of Sodom (1975)
Written and directed by poet and filmmaker Pier Paolo Pasolini, this film was slightly inspired by the Marquis de Sade's novel The 120 Days of Sodom. It's a harsh critique on the Italian Social Republic, which lasted until the final years of World War II. Torture, coprophagia, humiliation and rape are paired with raw graphical scenes that have been banned in several countries.
8. I Spit on Your Grave (1978)
A writer retreats into a house in the woods in search of inspiration for her new novel. Only a few days after her arrival, she runs into a group of men from the nearby town, who repeatedly rapeher. Still, she manages to escape and get revenge on her offenders. What puts it on this list? The rape scene is veeeery raw and graphic, and her payback doesn't lag behind.
A remake with the same title was released in 2010 and it was followed by two sequels (one in 2013 and the other one in 2015). However, the 1978 classic starring Camille Keaton will always be the one to watch.
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