The fact is the majority of 'under-18's' are probably mature enough to handle violent video-games like GTA IV. Especially nowadays, when violent films are so easy to get hold of too. I still think the age rating is there to be respected, but if a parent thinks their child is mature enough to handle a violent video-game and buys it for them, there should be no sanctions (well not serious anyway) brought upon the parent if something did happen. As like we all agree, violent video-games do not make people go out into the streets and kill people.