First I'd ask him why does he want to be persuaded that I'm a nerd.
Second, I'd politely ask him to give me the game, if he refuses, I beat him with the chair, and then realise that I'm not that interested in Diablo, but more into Starcraft, and if he has that particular game, I ask him politetly to give it to me. After he gives it to me, I beat him for making me beat him in the first place. That should teach him a lesson that you don't mess with modern-day nerds.