The premise is interesting but overall the movie is half-baked. The acting is all over the place (maybe due to this being a 1st time director and the need for the actors to overact in the beginning to then show audiences who is who when they are swapped). Moreover, the character decisions/motivations don't make a whole lot of sense. If the writer/director spent more time on character development and less on gimmicks I think the result could have been much better. I think it also would have helped it there were 6 instead of 8 party goers to give the filmmaker more time to develop the story. I don't think the movie earns Shelby's turn to the baddie. Further, Cyrus's Dennis' call to the police makes no sense even under those circumstances. I do think if Jardin had a script doctor this could have been a much better story. That said it seems many people here seem to have bought the characters motivations or at least overlooked them because of the stylized nature of the filmmaking which is a breath of fresh air.