WARNING: Some of the images in this post are considered highly disturbing to most readers. Please proceed with caution.
1. House Of 1000 Corpses (2003)
A group of teens traveling cross-country to write a book about roadside attractions come across a hitchhiker who tells them about "The Museum of Monsters and Madmen" — but when they arrive, they're horrified to learn they're meant to become part of the attraction.
2. Audition (1999)
A widower holds "auditions" for women to be his new wife, but the lady he chooses is a completely different person than he expected. You'll be confused for all but 10 minutes of the movie, and those 10 minutes are utterly unrelenting.
3. Black Christmas (1974)
A sorority house keeps getting dirty, creepy prank calls, and each girl starts dying off one by one. The worst part? Not every girl is aware that there are dead people in the house.
—Katie Gared, Facebook
4. Cube (1997)
Years before Saw, there was Cube — another movie about a group of people finding their way through a series of traps in order to survive. Except in this movie, they're in a gigantic cube, and the only thing they can remember about themselves is their own name.
5. Sinister (2012)
If you're not usually freaked out by horror films, this one will do the trick: A family moves into a house that's haunted by a creature named Bagul who EATS CHILDREN'S SOULS. What the heck?!?!
6. The Poughkeepsie Tapes (2007)
This movie is so horribly disturbing: It's about a serial killer who tapes his victims, including one girl he tortures for years. It's got a super authentic found footage feel that'll make your skin crawl.
7. The Descent (2005)
If you're claustrophobic, or terrified of caves, The Descent will definitely get to you. This movie's got it all: violent deaths, spelunking, jump scares, and even monsters.
—Michele Fordemwalt, Facebook
9. Funny Games (1997)
This bad boy's mostly terrifying because it could definitely happen in real life: Two guys hold a wealthy family hostage and play some really sick mind games with them.
10. The Ring (2002)
You've probably heard of this one: There's a creepy tape going around, and if you watch it, you'll die in seven days. Oh, and during those seven days, the spirits will mess with you and make your life a living hell.
11. Antichrist (2009)
A couple retreat to the woods after losing their child. While there, they start having strange visions and partaking in grossly violent acts. People who've seen this movie say they squirm thinking about it, long after watching.
12. The Conjuring (2013)
This story's from the same paranormal investigators who dealt with the IRL Amityville Horror, so you know this shit's gonna be scary. It's about a family who moves into a new house that is haunted by demons. And, I repeat: IT'S BASED ON A TRUE STORY.
—Robert Hoops, Facebook
13. 1408 (2007)
A man who writes about haunted houses and the paranormal is prompted to visit allegedly haunted room 1408 at the Dolphin Hotel in New York City, and a shitstorm of scary stuff ensues. This is based on a short story by Stephen King, so you won't be disappointed.
14. Shutter (2004)
A couple starts seeing some disturbing images in some of their photos — ghosts, demons, blood, you name it — and even worse, they learn that these strange occurrences are very personal messages from the underworld.
15. Suspiria (1977)
This movie's gorgeous, but don't let that fool you — it's so terrifying. A young girl joins a prestigious ballet company, but soon finds herself in the midst of a series of murders. Life hack: Never be ambitious.
16. [REC] (2007)
A TV reporter and her cameraman respond to a late-night emergency call that turns into a living nightmare. If you're into zombie movies, you'll honestly poop your pants during this one. This is the film that inspired Quarantine.
17. It (1990)
An entity, referred to as "It," appears in the form of it's victim's worst fears in order to exploit them. Um, that's TERRIFYING?!
18. El Orfanato/The Orphanage (2007)
A woman's son goes missing, and while searching for clues to find him, she learns of the horrible deaths that occurred at the orphanage she grew up in. This one doesn't rely heavily on cheap scares or overly gory scenes to freak you out — it's genuinely dreadful.
—Lindsey Nyomi, Facebook
19. The Hills Have Eyes (1977)
A family from the 'burbs is on a road trip when they encounter a group of savages in the middle of nowhere, Nevada. You'll never want to vacation again after watching this.
20. The Strangers (2008)
The Strangers is mostly terrifying because it could really happen: A man and woman are terrorized by three masked strangers throughout the night while staying in a cabin — and the reason for their actions will send a gigantic chill down your spine.
21. The Babadook (2014)
A little boy discovers a book about a character named The Babadook that comes to life and terrorizes him and his mother. This movie's been praised consistently, being called one of the best horror movies in years.
—Kaitie Doherty, Facebook
22. The Last House on the Left (1972)
Two teenage girls are on their way to a concert in New York City when they stop to buy weed. Unfortunately for them, their drug dealers are actually murderers.
23. Martyrs (2008)
Fifteen years after a scarring physical torture experience, two women are out for revenge. This has been described as one of the most uncomfortable films to watch ever.
—Daniel Greene, Facebook
24. And of course, Ju-On: The Grudge (2002)
A woman visits a family who lives in a haunted house, and unfortunately for her, two vengeful spirits become attached to her and set out to kill her. This is the film that inspired the American movie The Grudge.
Note: Submissions have been edited for length and/or clarity.