Unreliable narration strategies are not only a good opportunity for authors or directors to break with conventional plot patterns, they also encourage the recipient to rethink certain aspects of a book or a film.
At some times this can become quite puzzling. The most common forms of unreliable narration include a narrator that is either mad, non-trustworthy or limited in his or her viewpoint, a decomposition of the chronological order, multiple storylines and narrative loops or blurred borders between different states of consciousness.
Thereby, unreliable narration sometimes results in a plot twist which is an abrupt change of perspective that often involves a re-evaluation of the whole film.
Warning: Some of the film descriptions include spoilers, so you may leave out the ones you haven't seen yet.