Mark Waters’s Mean Girls (B+) is a hilarious sociological comedy about the class warfare teenage girls inflict on each other in high school. Lindsay Lohan is a delight as a teenager returning to America after living overseas until her junior year, and she is now exposed to the modern-day Heathers played by Rachel McAdams, Amanda Seyfried and Lacy Chabert. Infiltration of the cool crowd leads to dire consequences as the group lives and learns the Queen Bee mentality. Some jokes may hit too close to home for some, but this is a comedy that delivers.