I think Jimmy has a really strange personality. At one second he helps nerds and acts like a real good guy. But when he missunderstands the biology teacher, he doesn't doubt on killing Debbie Harrington. Or when the english teacher offer him some beer, he is glad to take it. So Jimmy can be a real good kid at one second, and at the next second be a sadistic maniac. What do you guys think of his split personality?