In brief: Janis (Lizzy Caplin) and her BFF Damien aka The Coolest People You’ll Ever Meet are the high school loners who guide Cady (Lindsay Lohan) through her first weeks at North Shore High.
Why we love her: She plots revenge against the popular kids, she gets some of the best lines in the movie - ‘Your mom’s chest hair!’ - and, most of all, her socially-awkward-but-straight-talking attitude is uncomfortably true to life.
Classic quote: ‘Oh, I love seeing teachers outside of school. It's like seeing a dog walk on its hind legs.’