Euro 2016 is drawing to a close. One of the most important football events, it was marred by widely reported fighting between the fans of rival national teams and brawls with the police. This kind of violence is not something unusual though - almost every major football tournament sees clashes between hooligans. What drives people to behave this way? Is it something about the sport itself? Is it just a way to blow off steam - or a culture of its own? We ask a man who knows all about football hooliganism. Best-selling author and the screenwriter of the award-winning feature, ‘Green Street’ - Dougie Brimson is on Sophie&Co today.