"How to Train Your Dragon" pits dragons against Vikings with one small child standing between them crying, "Why can't we all just get along?" The Vikings are all brawn and matted, bushy hair -- and there's an implication of not much brains -- while the dragons are a menagerie of fierce flying, fire-belching, multitasking creatures that fear and are feared in equal measure. From this, DreamWorks Animation tries to fashion a 3D movie that will intrigue kids and adults alike but might play raggedly in both camps.