And that's a compliment, by the way. Whovians tend to proudly brandish their Doctor Who devotion by dressing to impress in some sort of timey-wimey related t-shirt (or, of course, a Tom Baker scarf or a decorative stick of celery!) which means that you always know when you're in the company of a fellow fanatic. Go up and say "Hi". It could be the start of a long and beautiful friendship.