Oh look a way to keep people from further communicating with one another... armor up the ole gayass IPod. You want to know why people have become such assholes over the last 20 years, it is the way they have blocked each other out specifically with the use of headphones and such. They are in the own little 'I am the center of the universe' world tuned out to the everything and everyone around them, and when the phones come off, they don't know how to act.
