I have heard a few bizzare stories of people being addicted to gaming and online gaming.
I remember hearing of a lad who was obsessed with football manager that his parents had to get him help after they discovered he was pacing up and down his bedroom wearing a suit, thinking it was real.
Here is another bizzare story.
http://uk.news.yahoo.com/teenager-kills-girl-feed-video-game-habit-232801135.html (http://uk.news.yahoo.com/teenager-kills-girl-feed-video-game-habit-232801135.html)