I play games, therefore I know how a computer works. This doesn't make me angry, but I'm quick to point out that I only play games. I have no idea how a computer works, what's wrong with yours, or what type of whatever you need for it. Heck, I can't even figure out how to install Diablo III on my own computer.
I play games, therefore I have no real athletic skill/all I do is sit around. Ha ha, no. We'll see if you keep thinking that after we run a race, or play any game that involves speed. Now, I'm no pro athlete, but I tend to be in better shape than non-gamers.
I'm a gamer, therefore I don't have a girlfriend. Yeah, well...okay, fine. You got me on that one. Every time I start talking about video games, or a girl at work sees me reading Sailor Moon or another manga, I get the smile and, "Boys and their video games" or "You're one of those types, aren't you?"