Coherence (2013)

Eight friends living in Northern California reunite for a dinner party being held at the home of spouses Mike and Lee on the night of the passing of Miller’s Comet. One of the group, Emily, is hesitating over the decision of whether to accompany her boyfriend Kevin on a long business trip to Vietnam. To the partygoers’ consternation, their friend Amir brings Laurie, an inappropriately flirtatious woman and Kevin’s former girlfriend. During dinner, conversation becomes strained by the animosity between Emily’s close friend Beth and Laurie, compounded when Laurie antagonizes Emily by bringing up a ballet role understudy she lost by waiting too long to decide.

A power outage occurs, and Mike and Lee bring candles and several boxes of different colored glow sticks to use for light. The friends each take a blue glow stick, then venture outside, where they see the comet passing overhead. The entire neighborhood has gone dark, with the exception of one house that still has power. When they go back inside, they notice a broken glass that no one remembers damaging. Beth’s husband Hugh and Amir decide go to the lit-up house and ask to use their phone. When they return, both have wounds on their faces and are carrying a box which turns out to contain a ping-pong paddle and photographs of everyone, including one of Amir that could only have been taken that night, with numbers written on the backs.