The main thing with me is that my surroundings often remind me of certain games, and make me a bit happier. Snowy city = Indigo Prophecy, forest in autumn = beginning of RE4, that kind of thing. The weirdest one for me happened about a week ago, when I came across a beautiful wide-open place with about six old Buddhist pagodas, and the first thing I could think was, "Man, it's been so long since I've played Shadow of the Colossus."