Best horror movie?

Nomenclature

Argument Topic: Easy.

Event Horizon (1997).

I'd have said Aliens (1986), but it's not really straight horror. That one is a class and genre all of its own.

OakTownA

Jesus Camp (actually a documentary, so I joke, sort of)

Cabin in the Woods

Jacob's Ladder

The Lost Boys

Nomenclature, Aliens was one of a handful of movies that actually gave me nightmares, so I think it qualifies as horror.

Nomenclature

@OakTownA

Aliens was one of a handful of movies that actually gave me nightmares

Me too, in fairness. You've convinced me. Some other classics on your list there, too.