In the mid-1970s, Jay Leno, David Letterman, Andy Kaufman, Richard Lewis, Robin Williams, Elayne Boosler, Tom Dreesen, and several hundred other shameless showoffs and incorrigible cutups from all across the country migrated en masse to Los Angeles, the new home of Johnny Carson's Tonight Show. There, in a late-night world of sex, drugs, dreams and laughter, they created an artistic community unlike any before or since. It was Comedy Camelot-but...