Signs and twister were pretty terrible for a kid when you grow up surrounded by corn fields.

James Bond - The spy who loved me.

The scene I remember is that car diving into the sea and turning into a submarine. And when it came out again, all the people staring with their mouths open. Now all my life I want to have such a car!

:-)

I was not ready to see Mars Attacks. What is worse is knowing it is campy and ridiculous but I still can't make myself watch it again as an adult.

The Sound of Music.

Starship troopers. Still have the mental Image of the bug drilling a hole in a dudes head.

Also robo cop. All I can remember is him (only head and torso) being hooked up to cables and medical computers and one of the scientists says "what a weird kind of pain he's having" or something like that

In 5th grade Catholic middle school they show us an anti drug movie hosted by Rosey Grier. There's clips of people going through withdrawal, photos of people who smuggled drugs under incisions in their skin, all kinds of horrible stuff. It was similar to the real life gore movies they used to show during driver's ed classes. They did apologize after realizing they messed up. It's no wonder I didn't try weed until I was 18. I haven't been able to find this on the internet

Terminator 2

The Fly

This is going to be a departure from the rest of this thread.

I saw Emmanuelle when I was 10 or so, and man did that movie change me. Some scenes still pop into my head, clear as when I first saw them.

https://en.m.wikipedia.org/wiki/Emmanuelle_(1974_film)

The exorcist.

I was probably 8 years old, this thing gave me nightmares for years

When I was younger, I watched this movie where a terrifying creature, vaguely resembling a human and driven only by thoughts of death, escaped from a parallel dimension to hunt down a girl at her middle school, and there was this Wayland-Yutani type company who tried to cover up the escape by having their security force capture the creature and send it back to its own dimension, but then, the creature took the girl and her mother with it to its hell dimension, with the company security force in pursuit.

And then a bunch of guys who are way too into horses got in a big fight that turned into a dance number, and then creature went to the gynecologist for some reason.

I was brought to tears by the existential dread that still haunts me to this day that I decided to take a break from movies. But whatever that movie was, it should have won an Oscar this year.

Mars Attacks. Hilarious now but it absolutely traumatised me when I was younger.

Killer clowns from outer space, that clown thing that comes up from the toilet messed me up.

The Exorcist

Grave of the Fireflies.

Literally impossible to see that at an age where it won't scar you for life.

Watership Down.

Like, after I saw that movie as a kid, horrible things in other movies didn't really have an impact. Well... That, and I understood movies were all make-belief. I used to love watching making-of features for movies.

Nothing but Trouble

It's silly, but as a kid I once turned on the TV to Monty Python's "The Meaning of Life", and in particular, the scene where an enormous man is fed so much that he explodes. Still haunts me to this day.

Aliens.

That movie scared the shit out of me. It’s been more than 35 years and I still don’t like that movie.

Not exactly too young, but I shouldn't have watched Human Centipede

that scooby doo movie with zombies, spooky shit

Fire in the Sky... I am 40 and was maybe 10/11 when I watched it. I now have a legit fear of being abducted by aliens that makes it hard to sleep alone. I can't watch any movie that deals with alien abductions.

Evil Dead (1 & 2)

Everything claymation reanimated just scarred me lol. Years later in high school I remember watching Sam Raimi's Spiderman with the Doc Oc surgery scene, and that camera work took me right back to being too young for Evil Dead.

Sam Raimi has very distinct style

The Thing. I think I was 6 or so when I saw it. I had nightmares for years.

Probably mall rats just because after seeing Joey Lauren Adams tits I would spend the rest of my life searching for that high.

Edit: more honest honest answer is probably Ernest Scared Stupid. If that movie scared you, you were probably too young.

Ghost Ship. Every now and then the wire scene and the scene where they eat maggots comes back to me in my thoughts, and i hate it lol.