Today I saw a guy wearing this shirt:
, which I thought was cool. It seemed vaguely familiar to me, so I looked it up, and, duh, it's from the xkcd store. I should have known that.
And of course, being me, I didn't actually talk to the guy, but that was because I was at work and it was busy.
How about you? Any t-shirts you have seen or have that you really like?