21 Horror Movies That Are So Scary, People Were Screaming Or Holding Their Breath The Whole Time

WARNING: Due to the nature of the topic of this post, there are some SPOILERS AHEAD for the following movies. We've listed the titles first so you can decide if you'd like to read on or skip. Please proceed with caution!

Recently, Reddit user u/MythicalMicrowave asked the question: "What’s the scariest horror movie you’ve ever watched?"

A woman in dramatic scream, wearing 1950s style clothing, in a black-and-white scene

Here are some of the most top-voted responses:

1.Event Horizon (1997)

Futuristic cryogenic pods with people inside from a sci-fi movie scene

2.The Descent (2005)

A creature from "The Descent" crouches by a fire, looking menacingly at an unseen figure

3.The Wicker Man (1973)

Three people wearing animal masks (fish, rabbit, goat) standing outdoors with greenery in the background

4.Sinister (2012)

A person is dramatically posed, arching backwards over a box, with arms outstretched, in a theatrical scene

5.The Grudge (2004)

A ghostly figure with long hair and a pale face peers through staircase railings

6.Paranormal Activity (2007)

A person stands over someone lying on the floor in a dimly lit room, creating a tense atmosphere

7.Hereditary (2018)

A woman with wide eyes and mouth open, appearing shocked or scared, stands indoors wearing a light shirt

8.The Fourth Kind (2009)

Milla Jovovich screaming in the fourth kind

9.Poltergeist (1982)

A young girl, Heather O'Rourke, screams while being pulled by supernatural forces in a scene from the movie "Poltergeist."

10.Fire In the Sky (1993)

a scene from Fire in the Sky

11.The Strangers (2008)

A masked figure stands outside a window waving, while a woman in a plaid shirt looks at them from inside

12.Signs (2002)

Two men stand in a dimly lit room, one holding a flashlight, facing a figure turned away from the camera

13.The Ritual (2017)

A surprised man with an open mouth is seen in a dark forest setting, wearing a casual shirt

14.It Follows (2014)

A person floats peacefully in an above-ground pool surrounded by trees

15.Midsommar (2019)

A group of women in embroidered dresses, comforting one another, are shown in an emotionally intense scene

16.The Blair Witch Project (1999)

Close-up of a person's face in distress from a scene in the film "The Blair Witch Project." A beanie is visible on their head

17.The Thing (1982)

Creature from "The Thing" with distorted face and extended limbs in a menacing pose

18.The Evil Dead (1981)

A character with cracked skin and dark eye makeup peers through a chained trapdoor in a scene from a horror movie

19.The Exorcist (1973)

A girl with a possessed appearance lies in bed with a tube in her nose, featuring facial scars and disheveled hair

20.The Conjuring (2013)

Person crawling on a wooden floor, appearing distressed, gripping a door frame. Scene suggests tension or danger

21.Alien (1979)

Scene from sci-fi movie "Alien" showing the iconic chestburster moment at a dining table. The creature is emerging while shocked crew members watch

What other horror movies do you think deserve to be on this list? Let us know in the comments!

Some submissions have been edited for length and/or clarity.