Of course, in American Buffalo Mamet famously dirtied-down the English language. He returned low-life talk from the sleazier streets of life to the stage. His less than blue-collar characters, thieves on respectability's verge, were blue of speech. Their chatter was a rank, rich fizz of vulgarities and expletives. We middle-class theatre critics were thrilled to be introduced to the criminal classes - at several safe removes. We savoured the lingua franca of Buffalo's more daring thrusts. "I put my dick on the chopping block," rages William H. Macy as Teach , the ingratiating, betrayed crook who can find no thieving work. But nowadays no one turns a hair at "dicks" or much else besides. Last night, a moustachioed, brilliantined Macy, and cursing to the crude manner born, raised some laughs.