I played so much Battlefield 2, I could hear bullets whipping past my head, and distant artillery bombardments when I'd stopped playing. (True Story.)
I've been playing so much of Command and Conquer: First Decade, that whenever I do something someone asks me to do, I shout "Yes Commander!", "Going there..." or "FOR KANE!" in a bad Russian accent.
I've been playing so much Oblivion that I start conversations by saying "Rumours."
I've been playing so many Computer Games over the course of my life, I became an underachiever who 'must try harder'. (True Story.)