What happened to Boom Boxes?

I can't help but think the world would be a better place if more people carried around boom boxes. I mean cmon, how are you supposed to have a good old-fashioned impromtu, bike break dance thow-down if no one has a boom box handy? If only the D batteries required to power such a device weren't so expensive and harmful to the environment. Now that's a real world use for fuel cell technology.