Best "straight" horror movie I've ever seen.
Some movies like Rosemary's Baby and Invasion of the Body Snatchers still scared me a couple days after, but this was the perfect model for how horror should be done.
Short run time was key.
Elements of comedy.
Genuine creepiness.
Brief but not excessive nudity.
Awesome end credits.
Ending keeps sequel possibility.
Always been told this was a classic, glad I finally found the time see this.