"I just came from Cellblock D..."

Yep, another “who was that entertainer” thread…

A friend was listening to the radio a while back, and heard a routine by a comedian, the premise of which was that it was his worst gig, a job in a prison. He was told not to taunt the convicts, make any jokes about drugs, make any jokes about sex, and whatever he did, he was not to mention Cellblock D. I’d like to get her a copy of the routine. Does anyone know who did it?