This isn't a sign that I've played the game too much so much as an awesome coincidence. I went on a Half-Life 2 marathon, playing it, Episode 1, and Episode 2 all within a week. I went to the airport a few days later and the first thing I noticed as I walked in was a black-haired older man in a blue suit, holding a briefcase, standing on the far end of the terminal. He then turned and walked behind a crowd of people and I never saw him again. It's one of the coolest gaming-related things I've ever experienced; the resemblance was ridiculous, at least from where I was standing.