The banshee from Darby O’Gill and the Little People still creeps me out!
Mars Attacks. The screaming aliens and the guns that turn people into colorful skeletons.
Aliens. It wasn’t the movie itself, it was the TV adverts for it. A two-second shot of a door buckling as something pounded against it from the other side. I was exactly the right age to be shocked by the thought that you can’t shut the monsters out with just a closed door.
C.H.U.D.
Early 80s b-grade movie. Absolutely laughable from a modern cinematic perspective, but I haven’t touched it in over a third of a century due to how it scared the fark out of young-teenaged me. I have also taken a disliking to horror movies (in general) for that same reason.
The Cook, the Thief, His Wife & Her Lover.