The second movie starring Maika Monroe to make our list, It Follows did something very few horror films ever do: create a truly original monster. Basically an STD on two legs, the titular "It" is spread via sex, and if you contract the curse, this enigmatic monster will mercilessly hunt you down. And if it kills you, it then goes after the person who gave you the curse…and so on and so on forever.
Sure, the creature moves pretty slowly, but this thing can take any form necessary to get close enough for the kill. And no matter what, it never stops following—unless you push it into a pool and electrocute it. Well, that's what our hero Jay (Monroe) hopes, anyway. After picking up the curse courtesy of a one-night stand, she does her best to fry the monster with every electronic device she can get her hands on. And just to play it safe, she has sex with her friend Paul (Keir Gilchrist), who then passes the curse on to a prostitute, just in case the thing comes back.
And that leads us to the final eerie image of Jay and Paul walking down a neighborhood street, thinking maybe their terror is finally over. But in the distance, there's a man slowly coming down the sidewalk. Maybe it's just a guy getting some exercise, maybe it's someone looking for directions…or maybe it's a creature that can never die, coming back for round two. We never learn for sure as the screen cuts to black, leaving Jay's fate to the imagination.