Yellow Diamond

I disagree. The film is all about psychological terror. It's essentially a movie about an unstoppable serial killer. That's frightening in a more subtle way.

Psychological terror? No way. The enemy is a different physical organism looking to kill people as sport and the marines are just dying and trying to stay alive. It's more thriller than anything. They have to get away from this thing or kill it before it kills them. It's not scary it may be suspenseful.

But I doubt it unlocks anyone's fear of being chased in the jungle by some camouflaging being during the Vietnam war (i think it was).

Not scary at all.