10 Movie Characters Who Aren't What You Think
8. The Aliens Are Actually Demons - Signs
M. Night Shyamalan's sci-fi thriller Signs is, on the face of it, a film about extra-terrestrials invading Earth, and humanity's subsequent - and successful - attempt to repel them...with water.
Reports ever since the movie's release have suggested that Shyamalan wrestled with the studio over the more prevalent faith-based themes present in his original script, and was encouraged to tone them down in favour of a more conventional sci-fi film.
Legend dictates that Shyamalan's script originally depicted the aliens as demons, a concept lent further "credence" by a mock interview misinterpreted as genuine by many fans, and various subsequent, convincing fan theories.
The "evidence" is myriad: the aliens aren't scientific or evolved in any conventionally extra-terrestrial way with their crude appearance matching our typical conception of demons, their trickster-like behaviour is consistent with mischievous demonic actions, and if they are indeed demons, we can assume the water that killed them was holy water.
Above all else, it makes the "aliens" look decidedly less stupid for coming to a water-rich planet, because as demons, the presence of holy water likely caught them by surprise.
It's a tight enough theory that many fans have taken it as gospel, even if the original script has sadly never found its way online.