Among the most popular movie genres today are superhero movies (Avengers, Dark Knight, Man of Steel, etc.) and supernatural thrillers (of the Exorcist, Poltergeist, Ring, Amityville Horror, Grudge variety). One thing we haven't seen is superheroes crossing over with supernatural thrillers.
I'm not talking about stuff like Ghost Rider, where the "superhero" is also the supernatural being. I'm talking about "conventional" superheroes who don't have magical or supernatural abilities, but are superpowered in more physical ways (like Superman, the Fantastic Four, Silver Surfer, etc.) or have high tech tools or special skills (Iron Man and Batman) going up against the supernatural threats seen in movies like Ring, Grudge, etc. In the supernatural thrillers, human victims are often helpless against whatever demon or ghost is after them, but how would these demons/ghosts handle superheroes who are much more durable and dangerous than ordinary humans?
Could a fun movie be made from such a crossover concept?