The other night at the Shubert Theater, home of the freshly minted hit "Spamalot," there were lines everywhere. There were lines at the box office and lines at the cancellation window. There were lines at the souvenir stand and lines at the bar. There were lines upstairs, lines downstairs and lines on the stairs in between. But there was one spot with no line whatsoever: the ladies' room. That's because "Spamalot," Broadway's hottest show, drawn from the 1975 cult film "Monty Python and the Holy Grail," has managed to tap into a rare, highly prized Broadway demographic: men; specifically, the...