Best of Mean Girls-
Mean Girls is a 2004 American teen comedy film directed by Mark Waters and written by Tina Fey. The film is partially based on Rosalind Wiseman's 2002 non-fiction self-help book, Queen Bees and Wannabes, which describes female high school social cliques and the damaging effects they can have on girls. Tina Fey also drew from her own experience at Upper Darby High School as an inspiration for some of the concepts in the film.
Sixteen-year-old homeschooled Cady Heron and her zoologist parents Betsy and Chip Heron return to the United States after a twelve-year research trip in Africa, settling in Evanston, Illinois. On her first day of attending a public school, North Shore High School, Cady meets new classmates Janis Ian and Damian. The next day, Janis and Damian educate Cady on the school's various cliques and warn her to avoid the most popular and infamous one, the "Plastics". The "Plastics" are led by queen bee Regina George and include the insecure but rich Gretchen Weiners and sweet but dimwitted Karen Smith. The Plastics take an interest in Cady after rescuing her from a sexist classmate, and invite her to sit with them at lunch. Seeing that Cady is getting along with them, Janis devises a plan of revenge against Regina for a past slight, using Cady as the infiltrator.
Cady soon learns about "The Burn Book", an old journal of Regina's that is filled with rumors, secrets, and insults about other girls and some teachers at school. After finding about "The Burn Book" Janis devises a plan to get back at Regina. Initially, Cady doesn't carry out Janis' scheme for ethical reasons, claiming that she thinks Regina is a good friend. Meanwhile, Cady becomes attracted to Regina's ex-boyfriend, Aaron Samuels, and purposely fails math in order to have an excuse to talk to Aaron. Regina jealously steals Aaron back at a Halloween party by kissing him in front of Cady. This spurs Cady to fully commit to Janis' plan to cut off Regina's "resources". This involves breaking Regina and Aaron up, tricking Regina into eating "Swedish nutrition bars" that actually make her gain weight, and turning Regina's fellow Plastics against her. In the process, Cady unwittingly remakes herself in Regina's image, becoming spiteful and superficial, and abandons Janis and Damian.
When Regina is finally made aware of Cady's treachery, she retaliates by spreading the contents of the Burn Book all over the school, quickly inciting massive socially motivated brawls throughout the halls. To avoid suspicion, Regina inserts a fake label of herself in the book in order to blame Cady, Gretchen, and Karen, the only female juniors not mentioned in the book. Karen convinces the school's principal, Ron Duvall, that they did not write the book, who soon quells the fighting and gathers all of the junior girls in the gymnasium. Math teacher Ms. Norbury, whom the Burn Book defamed as a drug dealer, makes the girls face the ways they all treat each other and apologize to each other and the teachers; the plan sees success, as friendships are rekindled. When Janis' turn comes, she defies Ms. Norbury, confessing her plan to destroy Regina with Cady's help and openly mocking Regina. Pursued by an apologetic Cady, Regina storms out of the school and is struck by a school bus, breaking her spine.
Shunned by Aaron, grounded by her parents, and despised by her peers at school, Cady takes full blame for the Burn Book and becomes an outcast. After she makes amends with Regina, Cady's guilt soon dissolves, and she returns to her original personality. To make up for the math tests she failed, she joins the Mathletes in the state championship finals. Cady answers the tie-breaker correctly, and they win the championship for the school. At the Spring Fling dance, Regina's new boyfriend Shane Oman is elected King, while Cady is elected Queen. Onstage, Cady declares that all of her classmates are wonderful in their own way, snaps her plastic tiara, and distributes the pieces and throws them out to other girls in the crowd. She then reconciles with Janis, Damian, and Aaron, and reaches a truce with the Plastics.
The Plastics disband over summer vacation: Regina joins the lacrosse team to deal with her anger, Karen is the school weather reporter and Gretchen joins the "Cool Asians" clique. Aaron has graduated from high school and attends Northwestern University in Chicago. Janis has begun dating Mathlete Kevin Gnapoor, whom she initially disliked. As Cady reflects on the societal peace that has taken over North Shore High, a group of new "Junior Plastics" has arisen, and Cady imagines them being hit by a bus.