Coherence (2013): The setup is that a passing comet allows multiple realities to exist simultaneously. Which, from what tiny bit of quantum physics I tenuously grasp, is always true until events are observed - but now the realities can interact. But it's really a study in paranoia rather than science fiction, so as usual just disregard whether or not events depicted are possible or make sense. Low budget, no special effects, a lot of people talking in a living room. It's a bit clever, I guess, but doesn't take or make the time to fully expose even one of the characters. So it winds up being just a suspense film. 6/10.
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