Truth or Dare is an outrageous, insightful, carefully controlled and (to non-fans) overlong documentary of singer Madonna's 1990 Blonde Ambition tour. Though much of the film is a paean to self-love and self-aggrandizement, we are permitted to see Madonna at her worst as well as her best. Just when the audience is on the verge of giving up the flamboyant vocalist as a bad job, she displays a sudden attack of sensitivity, such as her protective attitude towards a timid homosexual in her troupe. Among the many celebrities who poke their heads into the proceedings are Warren Beatty, Sandra Bernhard, and Kevin Costner, who makes the fatal error of coming backstage to tell Madonna that he thinks she's "neat." If you've had your fill of the Material Girl, take a look at the parody documentary starring MTV's Julie Brown, Medusa: Dare to Be Truthful.