Coherence is a 2013 American-British science fiction thriller film directed by James Ward Byrkit in his directorial debut. Three couples—Emily and Kevin, Hugh and Beth, Amir and Laurie—attend a dinner party at the house of their friends Mike and Lee. On the way to the party, Em's phone loses reception and the screen spontaneously shatters. She blames this on a passing comet which she had heard about on the news. She tells the other dinner guests how a previous comet a century earlier had caused people to experience strange phenomena. Her idea is ridiculed until the other guests discover that none of their phones have power and that Hugh's phone has also shattered. Hugh wants to contact his brother, a physicist who had warned him about possible odd effects from the comet.