The opening of 'Memento' is quite interesting as the clip is reversed, which makes it very much linked to the title of the film.
The opening contains no speech but the scene is enough to explain the title and already make the audiences question what's going on, even more so that the film carries out the psychological-thriller genre well.
The music playing in the background helps create the thriller genre too. The music is very eery-like and sets you on edge for something to happen.
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