Horror movies are expected to leave you shaken, but sometimes it's the ones that aren't advertised as a horror that really get you.
From Shutter Island to Black Swan, there are some thriller movies that can really mess with your mind - and there's a 2011 movie in particular that some have described as 'bleakly terrifying'.
The movie was released back in 2011, and people are still talking about it.
In a Reddit thread titled 'What's the most horrific movie you have seen that's not billed as a horror?', someone said: "Martha Marcy May Marlene (2011). I watched it last week and can’t stop thinking about it."
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They added that the movie was 'deeply unsettling'.
Echoing similar sentiments, another person penned: "MMMM haunts me to this day. There is something so bleakly terrifying and twisted about that one. The vibe makes me feel so off."
"Yeah, that ending," another Redditor replied.
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"And even the way her family clearly don't understand what she's been through, so it just feels so hopeless."
"MMMM has this quiet tension… very unsettling," someone else added.
Martha Marcy May Marlene boasts an all-star cast made up of Marvel star Elizabeth Olsen, Sarah Paulson, Hugh Dancy and Ozark favorite Julia Garner.
The synopsis for the R-rated movie reads: "After several years of living with a cult, Martha (Elizabeth Olsen) finally escapes and calls her estranged sister, Lucy (Sarah Paulson), for help.
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"Martha finds herself at the quiet Connecticut home Lucy shares with her new husband, Ted (Hugh Dancy), but the memories of what she experienced in the cult make peace hard to find.
"As flashbacks continue to torment her, Martha fails to shake a terrible sense of dread, especially in regard to the cult's manipulative leader (John Hawkes)."
The movie was made on a tiny $600,000 budget and went on to make $4.7m at the global box office.
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It's widely credited as Elizabeth Olsen's breakthrough role, before she went on to play Wanda Maximoff/Scarlet Witch in the MCU.
Cult deprogrammer Rick Alan Ross has even dubbed the film the 'gold standard for any movie about cults' in an interview with Vanity Fair.
He said: "It is the most realistic depiction of what a cult would be like and the difficult of leaving the group and the recovery process.
"She feels, like many cult members, that thinking of leaving is being a traitor."
Topics: Film and TV, Horror, Reddit, Elizabeth Olsen