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In the regular world, Halloween is when children dress up in costume and beg for candy, but when it comes to Mean Girls, it's the girl world. The Halloween party scene has given some of the most iconic Mean Girls quotes, including Karen's famous “I'm a mouse, duh.“ Relive all the drama of Halloween in this full scene from the movie! Watch Mean Girls on Digital: Starring: Lindsay Lohan, Rachel McAdams, Tina Fey, Amanda Seyfried, Lacey Chabert, Lizzy Caplan, Daniel Franzese, Amy Poehler, & More! About Mean Girls: After living in Africa with her zoologist parents, Cady Heron (Lindsay Lohan) must brave the wilds of high school where she is taken under the wing of the popular girls, The Plastics, led by the cool and cruel Regina George (Rachel McAdams). What follows is a treasure trove of sharp, witty humor that defined a generation, inspired a hit Broadway musical, and popularized countless catchphrases. Co-Starring and wr
