I work at a software company so, obviously, we're a bit geekier than the average joe. But one co-worker, who had never before outed himself as a gamer, happened to wear a "Jesus saves, the rest of you take full damage" t-shirts.
Ironically, I work at a place that employs around 3000 engineers, and I've yet to meet another gamer. Though that's partly because I operate in full-on gamer stealth mode myself, plus we have so many buildings that it's not like I get to wander through the cubes searching for gamer sign.