Crushing its one germ of a good idea under a heap of teen-comedy conventions, “She’s Out of My League” supposes that if a quasi-normal guy actually won the girl of his dreams, his own insecurities would scuttle the deal. One can imagine Jack Nicholson strolling into helmer Jim Field Smith’s erratic story and bellowing “You can’t handle the babe!” as this appealingly cast movie seesaws from unlikely thoughtfulness to imbecilic vulgarity. Teen auds will respond in force, especially those among the semen-joke constituency.

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