After playing a chess game, whenever I see tiles I count how many moves it would take to get to another person's position if I were a knight.
After playing a lot of Battlefield 1942, when a prop-plane flew overhead I had to resist the urge to run for cover. Also, I'd get the urge to use my car to run people over, like the DEADLY jeep.
I always hear the MSN and gmail chat beeps in everyday life.
Pretty much any game I play for several hours, I mentally play as I sleep that night. It can get pretty interesting. I was playing FFX for the first time, and when the alarm clock went off the next morning, I mentally treated the alarm clock as a random encounter for nearly a minute, until it got loud enough to really wake me up. (I tried to have Wakka attack the snooze button.)
After playing Baldur's Gate II and Neverwinter Nights, whenever I was bored I mentally attempted to calculate how far away I would have to cast Fireball to just miss me, and which targets it would hit.
During various games that have the "E" key triggering generic "use" I would think "E" whenever I tried to get into a car, pick anything up, open doors, etc.
After playing Metroid Prime, I would think about launching missiles from my arm, and missile trajectories, particularly when a car with thumping subwoofers passed me.
Its fair to say that games have invaded my subconsciousness. Most things I do extensively invade my consciousness for a time. When I'm looking for something in a book, I always think ctrl-f.