Even if you travel all over the world you'll notice that there are certain signs that we all intuitively know and that transcend language. We all know the blue sign with a traiangular shaped woman that signifies the ladies room or a red hexagon sign that means "stop". Then why is it that more people don't recognize the universal message you're sending out when you put on a pair of headphones when someone sits next to you and seems like they want to talk?