Hot! Hot! Hot! That's obvious in a high school flick with Megan Fox as Jennifer, a sex bomb who turns she-demon and behaves like the heartless bitch she always was except for killing boys and macking on her mousy BFF (a terrific Amanda Seyfried). It's the smarts in the script by Juno's Diablo Cody that sneak up on you. Loved the excuse by a rocker (Adam Brody) for sacrificing Jennifer to Satan: "Do you know how hard it is for an indie band to make it?" We do. Director Karyn Kusama is torn between duty to female empowerment and slasher convention. But Fox shows a comic flair that Transformers never investigated. And Cody knows the horror of just being a teenager.