Mean Girls

Possibly the best movie ever. It was written by Tina Fey. It's about a girl named Cady (played by Lindsay Lohan) who moves to a new school and becomes friends with a clique of bitchy girls, who are nicknamed the Plastics. Cady turns into a mean girl from hanging out with the Plastics, but in the end she realizes her mistake. It's just about the most quote-able movie ever.