Writer-director David O. Russell's out-of-control filmmaking style is perfectly suited to a romantic-comedy involving mental illness, and he infuses the film with a sparky unpredictability that's echoed in the perfectly graded performances of the entire cast. Cleverly, even though most of the characters are clinically unhinged, they're all likeable and easy to identify with.

Cooper stars as Pat, who has spent eight months in a mental hospital before his mother (Weaver) comes to take him home early. His dad (De Niro) isn't so sure it's a good idea, but everyone's happy to have him home. And since he finally accepts that he's bipolar, Pat is ready to get on with life. But it's not so easy. He's prevented from reuniting with his wife because of a restraining order, so he visits mutual friends (Stiles and Ortiz) instead. And they set him up with Tiffany (Lawrence), who's psychologically damaged in her own way. Recognising similar needs, they agree to help each other.

Yes, the film has a clear rom-com premise, but the characters are so unpredictable that we are never quite sure what they'll say or do next. And it's not like Pat and Tiffany are the only unstable people here: they're just the only ones with official diagnoses. All of which gives the actors almost too much colourful material to work with. Cooper is a likeable, charming presence at the centre, eliciting our sympathy even when he does something stupid. And Lawrence delivers a full-on performance that often takes our breath away with its clever layering.

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