Shoppers better beware on Saturday December 17th at 2pm if they are in Washington Square Park. For those caught unaware, prepare for a show as spontaneous dance breaks out in the park. NYC Dance Arts is having a flash mob so make sure you don't miss it! You all might remember Modern Family's Mitchell breaking it down for Cam during a flash mob...so if you don't understand the concept check out the video below. Check out this webpage to take dance classes and participate in future flash mobs!