The Sitter (15)

Starring: Jonah Hill, Sam Rockwell, Ari Graynor

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In which Jonah Hill plays yet another slacker, this time taking at short notice his first babysitting gig and unleashing mayhem. Admittedly, his three young charges – a Little Miss Sunshine, a Salvadorean firestarter, a pill-popping worrywart – are no picnic, while the director, David Gordon Green (Pineapple Express), has the uphill task of persuading us they're fun-size charmers. The screenwriters seem to free-associate with the storyline, mixing drug-dealers and bomb-makers with bar-mitzvahs and burglaries; whenever the momentum looks about to fail they simply reintroduce characters at random, and the film putters on its way again. Hill isn't bad, but he must be getting bored with repeating himself.