Like its characters, Virzì's film exists on a knife's edge of instability, with its road-movie structure giving it a sometimes bracing unpredictability. And occasionally the pair's adventures carry deeper resonance beyond in-the-moment exhilaration, with both Beatrice and Donatella remaining locked into patriarchal structures and ways of thinking that have driven them to near-madness. Mostly, though, Like Crazy seems content to coast on the contrast between Beatrice's abrasive energy and Donatella's quiet anguish, with neither character developed with depth sufficient to justify the time we spend with them. Nor do these wanderings lead anywhere interesting. Virzì's film ultimately adds up to little more than the tale of two mentally unstable people finally coming to accept their insanity -- an awfully thin arc on which to build an overextended road-trip movie.