Artax in the Swamp of Sadness

A Watership Down. Fucking trauma for years.

Fire in the Sky Just no. I couldn't even look at an image of a grey alien for years. Had to look away during the opening credits of X-files because they flashed an image of a grey. I got over it. I actually rewatched it during the pandemic lock-in. It holds up pretty well.

Blair witch project. I really thought it was real founded footage

This was definitely not a horror movie, but I watched it as a very young kid, so even as an adult I don’t like this fucker.

Poltergeist. Fucked me up around static for the rest of my life.

Stephen King's IT. Technically a mini-series. But it messed me up for awhile, especially the blood on the shower wall scene.

I was a real scaredy cat as a kid, so for me Terminator and Jurassic Park were the ones I remember giving me nightmares that other people would know. Outside of that weirdly the movie "the edge" with its bear terrified me, I always imagined a bear could just rip through the wall of our home and grab me. Another weird one was The 13th Warrior, there was a particular scene in.a bloody cabin that really upset me, but I dont think the movie was really scary, I was probably just way too young to watch it

My cousins made me watch John Carpenter's The Thing when I was eight years old. Assholes.

The movie Saturday the 14th also messed me up for a while, what with the Creature from the Black Lagoon getting into someone's bathtub through the drain pipes. It may be silly dreck, but it was a bit much for a five year old.

Oh wow, yeah Event Horizon is not a good movie to see in your youth haha. That's intense!

For me, I didn't get to see the whole movie, but I walked into the living room while my parents were watching Hostel and I saw the achilles tendon scene. That imagery still haunts me to this day. Grew up to love horror, though!

Raiders of the Lost Ark. 12 year old me had a great time with that movie until people startet to melt...

John Carpenter's The Thing. I wouldn't go down to the basement by myself for like three months.

Still one of my favorite movies.

Arachnophobia. I one of the ones that claims I acquired a minor version from the film. Took me years to get over it. Of dedicated effort, after I grew up. Even today a sudden sighting can sometimes get a squeak out of me though, annoyingly.

Jaws. I was literally scared to take a shit for a while.

House of wax (1953). Invasion of the body snatchers (1956 and 1978).

The Ring got me pretty bad. Was scared to even turn on the TV .

I’m almost too embarrassed to admit it - Little Shop of Horrors (1986)

I too was a weaker constitution child and had to leave Beetlejuice and Jurassic Park.

I also ended up scared of Leprechaun in a hotel room when I was like 6.

One that sticks out that I've never been able to place, though. I was in another hotel room with my dad and woke up to it. All I remember was a gargoyle or something was killing people and at the end they managed to trap its spirit in a chair and then burned the chair in a fire. I had nightmares about that movie for years after but have never been able to figure out what it was.

When I was 17 I saw Halloweentown and the part with the ghosts made me shit bricks

Mars Attacks when I was 6. My parents had the brilliant idea to take me to see it at a drive-in, so larger than life screen, and it was the second film, so I think they probably figured I’d fall asleep and they could stay and watch. Nope. Pretty sure I didn’t sleep for weeks.

Human Centipede and its sequel.

The Pit and the Pendulum. I had nightmares about it for decades.

Poltergeist. Saw it when I was like 7 and was afraid of mirrors for years after that. They still feel eerie to me at night/in the darkness.

Fright Night (the 1985 one). I was 6. The idiot daughter of the woman babysitting me thought I was asleep on the couch, so she put it on.

I was not asleep.

Poltergeist 2. I must have been 6 or 7 the first time I watched it. The designs and special effects were amazing. This scene in particular fucked me up big time:

https://www.youtube.com/watch?v=ZMQCyJ2lhu8

Cats Eye

Don't Be Afraid of the Dark (IMDb), a 1973 made-for-TV movie. I was single digits old and remember watching the living room TV hiding behind the legs of a kitchen chair.

The damn rabbit from Monty Python

The Shining. Watched it when I was under ten years old.

Couldn’t sleep with the lights off for months.

But I agree with OP about on the Event Horizon movie. My experience with that film was great cause I just expected a sci-fi movie. Instead I got a twisted vision of horror that still haunts me to this day.

Shutter (US version). Later on in college, I watched the Thai version. Both scared the crap out of me.

Last movie that gave me nightmares was Mirrors (2009). I was alredy barely an adult back then.
I woke up in a panic for 2 weeks straight and put on the light to check my mirrors. I recently decided to watch it again. It's pretty underwhelming and random af to me now. Didn't scare me in the slightest (aside from a few cheap jump scares, but I hate them anyway).

70s - Black Christmas
80s - Poltergeist, The Changeling

El Orfanato. Watched it as part of a foreign language film club at school when I was about 12/13. Over a few weeks we watched some Ghibli, some great Italian films and then this.

Nothing could have prepared me for this film, I'd never watched a horror movie before. I had nightmares for at least a month, and I'd actually be hesitant to watch it even now because it scared me so badl!

Has to be said though, was a great film and it had me choking up at the end.

Independence Day. Specifically the autopsy scene. The voice they used kept me up for weeks.

Trilogy of Terror messed me up pretty badly as a kid. I kept my feet off the floor for a week. I just kept jumping around from piece of furniture to piece of furniture.

I saw Event Horizon in my 20s. My bro-in-law and I thought it was just going to be a goofy horror movie that we could laugh at.

We were wrong.