Coherence
so the rewatch makes it even better if that was even possible.
it's not just a "shock me" film for the sake of it or relies on one moment, no. it gives proper explanation and clues for the story overall if you really pay attention and in the second watch it'll definitely fill up all the gaps in your minds about the film that you may have had after the first watch. from start to finish it's brilliant and genuinely fucks with your mind in the best way possible.