Since Seinfeld first hit the airwaves in 1989, Jerry, George, Elaine and Kramer have drunk gallons of coffee, poured hundreds of bowls of cereal, eaten a ton of Chinese take-out and wound up a lot of people, as the world watched and laughed. And in the course of doing virtually nothing, they revolutionized TV sitcoms and helped us all to better appreciate the most trivial personal and social issues of our time.