Do you think Horror is perhaps the only
universal genre in terms of being explored or used in any movie that
isn't Horror?
For example:
Jurassic Park - NOT a Horror movie, yet the T-Rex scene with the kids in the SUV is showered with Horror and is terrifying.
The Dark Knight - NOT a Horror movie, yet Heath Ledger is terrifying as The Joker.
Pulp Fiction - NOT a Horror movie, yet the scene where Butch and Marcellus Wallace are tied up in that store with the Gimp, and Butch escapes and goes back to rescue him is very much founded on a horrific, disturbing concept.
The Matrix - NOT a Horror movie, yet the scene where Neo finally wakes up in the pink pod, bald head, naked, and discovers the other pods and the sentinel shows up... That scene still chills me to my core to this day.
Eyes Wide Shut - NOT a Horror movie, yet the scene when Tom Cruise enters the mansion... that whole scene has a bizarre, disturbing feeling to it that is almost horrific.
I read often that the line between Horror and Comedy is extremely thin, so perhaps Comedy would be the other universally used genre in almost all films.
I don't think there's another genre like this, though. It would be impossible imagining a shoot out or a car chase in Eyes Wide Shut.
