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Joyce Hyser, 'Just One of the Guys'
Teen journalist Terri Griffith goes undercover as a guy at a new school... for journalistic reasons? Sure, why not. Complications ensue when she falls for her best friend, who thinks she's a he -- and gay. So she disabuses him of that nation by ripping her tuxedo shirt open at prom.
Bonus leer-fodder for those who enjoy the male torso: Terri's boneheaded college boyfriend prances around in a swimsuit, and there's always the locker room...