Is there a correlation between violence witnessed through the media and violence in real life?

Question From User - Answers in Comments.

I was dancing at the clubs last night, and so many people were hostile and angry all night, for no apparent reason. Mix that with a few cocktails, and whoa … I though Armageddon came at closing time. Little itsy-bitsy women were taking down cops; every establishment in town had a cop, ambulance, and fire truck. Men were fighting, and just there was general mayhem EVERYWHERE. I don’t think anyone died … but even after a sports team wins there has been more order.

I guess my only thought is that many people may have been digesting so much negative stuff by watching the VA tragedy, and I was wondering if there is a psychological terminology or study that would show a correlation between violence witness through the media and violence in real life.

OR I'm looking for a social explanation on why ppl were so violent last night (especially the women). Good greif.
Whoa - the little itsy-bitsy chick was Asian. I didn't even think race until you said so.