Perfect Blue
I absolutely love how this movie handles horror to scare the audience.
Instead of jump-scares or doing something unexpected it does something else. What's more scarier than the unexpected? The expected. It lets the audience digest what just happened or what is going to happen, and by the time the audience does understand what they just saw...its too late.
The first two acts of this movie tackle dealing with the future, making mistakes, dealing with the fact that what has been done...cannot be undone. Mima went from a Pop Idol to an Actress and throughout the whole movie she is stricken with the same question over and over again...was that the right decision?
The last act of the movie scares the audience by displaying another question...What's real? The suspense and build up is at an absolute max at this point and it still somehow keeps growing, and its when the final reveal happens and all the build up reaches its conclusion that the audience are at the edge of their seats.