Go!
Tetris is by far the worst offender, I'm sure most of you will agree. You play for a good long while and then you're subconsciously thinking of what piece would best fit in the area you're looking at. I could use an L shaped one here between my desk and the wall, placed upside down.
Of all the games I've played, Katamari takes second place. I first started playing when I was learning to drive. Even before I had the confidence to drive to the driving school myself, I would have the urge to grab the wheel and steer my dad's truck into the traffic cones to roll them up. I still refuse to use music from the Katamari soundtracks when burning CDs for driving with. They're such perfect driving music, too.
The only other one to stick with me was one from the GTA series. Nothing too illegal, just this weird thing I always do in the games. Whenever I came to a stop light on foot and a pick-up truck happened to be there, I'd try to get the guy to jump onto the back and see how long he'd stay on, and where the truck would go. The last time I went to the post office (or maybe it was the convenience store), I came across a truck at a stop sign and nearly took a step forward to do that very thing.