Flash mobs used to be so much fun. A group of people would arrange to meet in a public place at a particular time and would perform a song or a dance number or some other form of entertainment very suddenly and without warning. Well, the term "flash mob" is rapidly coming to mean something else now. All over the country, young people are using social media and other forms of communication to coordinate shocking large scale crimes. At first there were just a few isolated "mob robberies" around the country, but now we have a full-fledged flash mob epidemic...