Mean Girls
Soon, Cady joins the Plastics, and Janis devises a plan to shatter them.  Cady convinces Regina to eat these bars that will make her gain weight instead of lose weight. However, Cady becomes too much like the Plastics, and throws a party at her parents' house without their permission. She tries to hook up with Regina's boyfriend, but he rejects her because she's "just like a clone of Regina now".  Janis tells Cady that she's just like one of the Plastics now.