"The Comedy of Glamis", "The Scottish Business" or simply "That Play" are just a few of the euphemisms actors use to avoid mentioning the title of William Shakespeare's Macbeth, one of the most ill-starred plays in Indeed, many professionals believe that "The Unmentionable" [another of its nicknames]-with its bloodshed, ghosts, and witchcraft--is one of the darkest dramas ever written. If an actor does happen to mention the name, or quotes from the play while he is backstage, tradition requires him to leave the dressing room, turn around three times, spit, and then knock for reentry. Theatrical history is litte