Unreliable Narrator
Telling the story through a character you can't trust, because they are lying, mentally unwell or fooling themselves. At some point, you have to rethink what you were told.
The Shining
The film never fully settles if the hotel's ghosts are real or if Jack's alcoholic psychosis is making them up. You can read the story as psychological and as supernatural at the same time.
Atonement
The final act reveals that the entire story has been Briony's novel. It is her version of events, including a reconciliation she imagined. Every scene before it turns out to be a beautiful lie she wrote to forgive herself.

