I recently saw “Rampage” from 2009. Its basically a movie where a spree shooter is portrayed as the good guy/anti-hero. Several parts gave me that pit in your stomach, teeth gritting uncomfortable moment. I really hated it. Although I’m not surprised there are sequals I am disappointed and will not be watching them.


I don’t remember what it was called, but there was one I watched in theaters in 1st grade for a class field trip that would absolutely freak me out today. It was a documentary on bugs.
Edit:
I misread it as non-horror documentary.
I cannot think of any films right now that really scared me, but I might come back if any come to mind. Closest I can think of would be things from cartoons, like the moon spirit thing from Courage The Cowardly Dog or a Goosebumps commercial where they show a scene of a mummy rising and the kid banging on a door because they couldn’t get out.