From today's transit etiquette spread in the Vancouver Province:
The upside of quiet headphones and loud music is that you don't have to hear from the troublemakers or people looking for "just another 50 cents" so they can get back to Surrey. You can be part of the iPod Nation, disconnected from the unwashed masses. Remember Maxwell Smart's Cone of Silence?
Problem: Hearing what you don't want to hear
Solution: CD player, MP3 player — or just a pair of headphones so you can fake listening to something