Black, S. L., & Bevan, S. (1992). At the movies with Buss and Durkee: A natural experiment on film violence. Aggressive Behavior, 18, 37-45.

Abstract:  129 English-speaking adult movie-goers attending commercial showings of a violent movie (VM) or non-violent movie (NVM) responded to an aggression inventory, either before or after viewing the film. No sex differences in response were observed. Ss attending the VM had significantly higher aggression scores than Ss attending the NVM, both before and after viewing. Ss attending the VM showed a significant increase in aggression scores, while Ss at the NVM did not. Audiences who attend VMs have an initially higher level of aggressivity, which is heightened after exposure to the VM. Results support the hypothesis that attendance at a VM promotes aggressive tendencies. (PsycINFO Database Record (c) 2004 APA, all rights reserved)