It is Tom Stoppard's very special skill as the master comedian of ideas in the modern theater to create brilliant, biting humor out of serious concerns. Virtually assaulting the audience with a cascade of words and a conspicuous display of intellect, Stoppard, in Every Good Boy Deserves Favor, contrasts the circumstances of a political prisoner and a mental patient in a Soviet insane asylum, to question the difference, if any, between free will and...