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Movies struggle to capture what’s shaggy and bitter about writers without falling into the trap of one-liners.

To cite just one, Michael Savage, the conservative radio personality, told a long, shaggy story that involved being served a hot dog while traveling on Air One.

He and Davidson have a wonderfully shaggy dynamic, muttering jokes under their breath.

This shaggy, silly movie works because you want to be there wherever the leads fall splat on their faces: a blood bank, a brawl, an ambulance.

Her character in this shaggy, affable message movie may be nameless, but the specifics of her performance howl with righteous intent.