48 male Ss witnessed either an aggressive boxing film or a film depicting nonaggressive sporting activities. All Ss then delivered electric shocks to an experimental accomplice. During such time Ss either were stimulated with white noise or were not so stimulated. The greatest degree of aggression toward the accomplice was manifested by Ss who had seen the boxing film and had also received noise. Results were discussed in terms of L. Berkowitz's proposal that arousal increases the probability that a person will react aggressively to aggressive stimuli. (18 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.