Walters, R. H., & Thomas, E. L. (1963). Enhancement of punitiveness by visual and audiovisual displays. Canadian Journal of Psychology, 17(2), 244-255.

Abstract:  A film of a knife-fight scene or one showing adolescents engaged in constructive activities was shown between pre- and postest trials of a “conditioning” experiment. The experiment required S to administer shock to another person for “errors” in a learning task. Ss exposed to the aggressive movie showed a significant increment in level of pain-producing shock selected for administration, in comparison with the control group. The Buss-Durkee Hostility-Aggression Inventory, used as a supplementary measure, yielded no consistent differences between experimental and control Ss. (PsycINFO Database Record (c) 2004 APA, all rights reserved)