What does your shirt say about you?

I want to run this simple test one day where I go to a school, high school preferably, and stop all the students who are wearing a t-shirt promoting a band, singer, group, etc... to really see if they know who they are or have even listened to their music. I believe in promoting on something that you know. I don't know how many times I've seen kids wearing rolling stones t-shirts just cause they think its cute. I bet a lot of them won't be able to name me one song from the rolling stones. (and I can't get no satisfaction" doesn't count cause Britney covered it)