See how NBC's famous show "about nothing" -- one of the most popular sitcoms of all time -- first became "must-see TV." Jerry (Jerry Seinfeld) leads the Manhattan foursome that also includes frustrated George (Jason Alexander), sometimes-shrill Elaine (Julia Louis-Dreyfus) and, of course, Kramer (Michael Richards), Jerry's big-haired, eccentric neighbor with a knack for unique entrances. Keep an ear peeled for your favorite catchphrases.