Everyone who insists that romantic comedies have to be predictable and formulaic should see this film. Not only is it charming and funny, but it takes a strikingly original approach that leaves a big, stupid grin on your face.

Tom (Gordon-Levitt) is a shy greeting-card creator who's instantly smitten when he meets Summer (Deschanel), although it's not until Day 4 that he realises he's falling for her. But when things start heating up, she tells him she wants to keep it casual without getting serious. A happy non-relationship ensues, but by Day 300 he's in abject misery. His friends (Arend and Gubler) aren't much help, and even his smart little sister (Moretz) can't offer him any useful advice.

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