Movie Violence

I like this study on movie violence. When a violent movie comes out, crime drops while the movie is playing, and remains down into the mid-week. This may be causal - it is at least correlative. A causal explanation might be that violent movies incapacitates violent people, much like prisons incapacitate violent offenders. Now we just need a study like this that looks at video game violence. When really violent video games are released, do we spikes in measures in juvenile delinquency? I suspect we do not.