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Coherence
On the night that Miller's Comet passes Earth, eight friends gather for a dinner party at the home of couple Mike and Lee. Emily is hesitant to accompany her boyfriend Kevin on an extended business trip abroad. Amir has brought Kevin's ex-girlfriend Laurie, who flirts inappropriately with Kevin.
A power outage occurs. Mike and Lee get out candles and colored glow sticks. The friends each take a blue glow stick and venture outside, where the neighborhood is dark except for one house that has lights. Back inside, they notice a broken glass no one remembers damaging. Amir and Hugh decide to ask to use the phone at the lit-up house, as Hugh's physicist brother had insisted Hugh call him if "anything strange" were to happen during the comet's passing and as no one's mobile phone has a signal.
Hugh and Amir return. Hugh has a cut forehead and Amir has brought back a box he found at the other house containing a ping-pong paddle and photographs of everyone with numbers written on the backs. Hugh says he looked through the window of the other house and saw a table set for eight. They surmise the other house might be an alternate version of theirs.
Hugh writes a note to leave at the other house, only to find an exact copy of the note pinned to their own door. Emily, Kevin, Mike, and Laurie decide to go to the other house. On the way, they encounter another group of four people who look like them, carrying red glow sticks rather than blue. Each group flees back to their houses.
Hugh retrieves his brother's book from his car, which deals with quantum decoherence. They speculate that the comet has created mirror realities, one of which will collapse after the comet has passed. They surmise that anyone passing through a particularly dark area outside will emerge into a different reality. Mike drinks heavily and considers killing their doubles before the doubles can kill them. He decides to write a blackmail note to the other Mike to keep him from the book.
The group realizes Hugh and Amir, in their midst, came from the other house. The two take the box and leave, then return carrying blue glow sticks. They had found two notes at the other house, showing that the split created more than just two alternate realities. Beth sees Laurie kissing Kevin in the hallway. Someone outside smashes Hugh's car window. Emily retrieves the ring Kevin gave her from her car. Talking to Kevin, Emily realizes she is from a different reality.
The group creates their own box to validate they are all from the same reality. In addition to numbering the photographs by rolling dice, they include a randomly chosen object. Emily deduces that only Lee and Beth, who never left the house, originate from that house; she herself, Kevin, and Laurie are from a different house; Hugh and Amir are from a third house; and Mike is from a fourth. The blackmail note arrives under the door, revealing an adulterous liaison between Mike and Beth. Another Mike breaks in, attacks his double and leaves.
Emily goes out and looks into several alternate houses until she finds one in which no one seems aware of the split. She lures everyone out of the house by smashing Hugh's car window, then ambushes the alternate Emily, sedating her with ketamine when she gets a ring out of her car and locking her in the trunk. She takes her other self's place while Miller's Comet breaks apart overhead, but must subdue and hide another Emily who crawls into the bathroom. She takes the ring from her defeated self after losing her own in the altercation, then returns to the living room, where she passes out.
Emily wakes in daylight on the sofa with the rest of the party apparently none the wiser. Kevin returns her ring, which he found in the bathroom. His cell phone rings; bizarrely, Emily is calling. Emily looks at the two rings as Kevin answers the phone and then turns to look at her.