When her prep school eliminates girls' soccer, star player Viola Hastings (Amanda Bynes) switches teams all the way. Putting shared custody to work for her, she takes the place of her twin brother Sebastian (James Kirk) at his new school, their old school's rival, while he absconds to London with his band. Mom (Julie Hagerty), meanwhile, is too absorbed in the upcoming deb ball to notice, and Dad is out to lunch with his collar turned up. Obviously, conditions couldn't be more perfect for a girl looking to pass as a boy to trounce her ex-boyfriend on the pitch, which is just what she does.
She gets away with it thanks to her stylish hairdresser friend and some coaching in male swagger. As a boy, the doe-eyed, baby-faced Bynes makes a pretty convincing weirdo, and it's a wonder she doesn't ever find herself staring down the barrel of a Kolar during the movie. But her roommate, Duke (Channing Tatum), is not only the soccer team captain, he's also a sensitive guy, and open to ideas. When Viola-as-Sebastian claims the tampons in her luggage are for nosebleeds, he manfully gives them a try.
A breezy farce adapted from Shakespeare's "Twelfth Night" by first-time screenwriter Ewan Leslie and Karen McCullah and Kirsten Smith ("10 Things I Hate About You" and "Legally Blonde"), "She's the Man" is so good-natured, and its cast seems to enjoy itself so thoroughly, that the total annihilation of disbelief it requires winds up feeling like a reasonable enough request.