Depends on the band. Pick the right one, and it can convey a lot about your personality. I'd strike up a conversation with anyone wearing a K's Choice t-shirt,

Depends on the band. Pick the right one, and it can convey a lot about your personality. I'd strike up a conversation with anyone wearing a K's Choice t-shirt, because I've been to their shows, and I know their fans are generally a self-selected group of wonderful, wonderful people who had remained fans throughout their decade-long hiatus. It's hard to make similar generalizations about someone wearing a Led Zeppelin or John Lennon or flavor-of-the-month-superstar shirt, but even that implies a probable bit of information about their personality.