I can play casually in any position, lying down, slouched, crossed legs, on my bed, on the couch, on the floor, standing, sitting, walking or jogging on my treadmill, even upside down hanging half way off the furniture. But there is one and only one stance for when shit gets real. Back straight, feet planted, controller lowered, eyes forward. My friends have all pointed it out before.
I do occasionally listen to other music while I play games. Sometimes you've heard the games music so much you have to or youll go insane. Speaking of music, DOA beach volleyball has made it so I always have to play George Duke's "Brazilian Sugar" in any game with a casino. Mass Effect 3 citadel DLC? You bet I was playing that in the background.
When I play a game like fallout new Vegas I'll often get a playlist ready that sounds like the music the game already has, drifting along with the tumbling tumbleweeds, that sort of thing. I also never smack talk. Ever. Let your skill do the talking in a game, not your mouth.