Playground songs may also feature contemporary children's characters or child actors such as Popeye, Shirley Temple, Batman or Barney the Dinosaur.[33] Such songs are usually set to common melodies (a popular Batman-themed song uses much of the chorus of "Jingle Bells") and often include subversive and crude humor; in Barney's case, schoolyard parodies of his theme song were a driving force behind a massive backlash against Barney in the 1990s.[34]