There's almost nothing as funny as watching people behave really badly — and though Yasmina Reza's God of Carnage doesn't have a lot of depth, when the playwright lets loose the force of her ferocious, unforgiving intelligence, there's definitely a lot of bad behavior. The two couples involved, Michael and Veronica and Alan and Annette, exhibit no real feelings; their rages don't make sense, their quarrels are meaningless, affection is non-existent. These people are like human bumper cars set loose on a track — and in the Curious Theatre production, with its elegant set and first-rate cast, their collisions were hilarious.