Coherence (2013)

If you have an affinity for mind-bending riffs on quantum physics, you'll enjoy "Coherence." Most of these types of stories take the concepts of quantum mechanics (entanglement, superposition, etc.) which exist at the most microscopic--level (electrons, particles) and posit that similar effects could happen at the macro-level (real-world people and physical objects). "Coherence" takes a nightmare dinner party scenario (ala "The Invitation") and applies the quantum concept of coherence and "many-worlds interpretation" (or multiple universes) that is triggered by a passing comet. It's better to come into this with as little info as possible to enjoy the unwinding of the mystery. While its a bit of a slow burn at first, the filmmakers really nail the ending.