Three Acts.

In the film, Mean Girls, the first act consists of the protagonist, Cady Heron, meeting all of her new school friends, Janis, Damien, and all the Plastics. At first, the Plastics are "wonderful" to Cady, pretending to be nice and inviting her to sit with them at lunch, thereby inviting her into their little group. However, Janis then reveals to Cady that they are actually evil robots that will ruin her life, and they concoct a devious plan to destroy the group. The plot point of the first act, the point where the storyline peaks in this act alone, is that one fateful Halloween night when the Plastics trick Cady into their Halloween party to go as an "ex-wife". By the end of the night, the closing of the first act is created: the plan Cady, Janis, and Damien create to destroy the group. This plot point, like a classic Hollywood film, occurs closer to the end of the act.

In the second act, the plan is executed, and Cady starts being a secret spy for the less cool "art freaks", while attempting to maintain her reputation within the Plastics. However, not surprisingly, Cady gets carried away after she realizes that she has the power to bring down the leader, Regina George, and replace her on the social ladder. Cady gets invited to all the parties, gets all the attention from the Plastics' loyal worshipers and boys, and receives all the perks of living the life of a Plastic. The peak of the act, the turning point, occurs when Cady skips Janis's art show to hold a party at her house when her parents are away, resulting in the wrath of Regina's Burn Book being exposed to all the students in the school and Janis turning away from her friend, Cady, and this plan as a whole. The end of the act happens when the Burn Book is distributed to the school, all the girls in the school are forced to stay behind longer to make amends, and Regina gets hit by a bus. Again, the plot point occurs at the end of the act, and the climax of the film occurs close to the end of the film.

In the last act, Cady learns the lesson from what she has done, and what she has turned into. In a quick resolution, "Girl World" is at peace once again, the Plastics are demolished (all the members go on to do their separate activities), and Janis, Cady, and Damien are once again a happy group of friends: the happy ending structure.

Happy Halloween :).