Some said the Detroit Pistons of the late 1980s played dirty. Others said it was just aggressive. But either way, the Pistons were champions. Relying on physical defense, Bill Laimbeer, Isiah Thomas, Joe Dumars, Dennis Rodman and the rest of the Bad Boys pushed, shoved, elbowed and beat their opponents. Detroit defeated Michael Jordan's Bulls on the way to NBA titles in 1989 and 1990.