Audience Fight During Djokovic Match

Remember that fight in the stands during the match between Djokovic and Petzschner at the US Open yesterday? You know, the one that caused play to be stopped? Fortunately for us, someone in the audience filmed the incident and posted it on youtube. I don't want to ruin it for you, but it does involve an argument that leads to an old man and younger man falling down the stairs. It's crazy. Enjoy!