We pass people everywhere--on the street, in the mall, at the grocery store, in the library--and we tend to think that they are all basically just like us. Sometimes we even feel guilty that we interact with so few of them because we are too busy, too self-absorbed or too afraid. But they're always around us, and every one of them is unique. Here are twelve people you've encountered in your travels. Some would have appreciated your help, some might have become your friends, and others you were probably right to avoid. These are their stories. You be the judge.