They miss so many amazing things by not looking around them, are they scared to make eye contact or what? It's not gonna kill them!
And then there are those people who walk and stare at the ground but as you get close they take out their cellphone and mp3, always changing songs or getting a text when passing someone, always!
It's like nobody has the courage to look at another human in the eyes nowadays, or something.
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http://img.imgcake.com/cosplaygifer.gif
http://en.wikipedia.org/wiki/TORtanic