I just watched this amazing vid by Todrick Hall and I friggin loved it! He choreographed and coordinated the whole thing in its entirety! I just love the whole positivity that a flash mob can do. I know they've received a bad rap lately due to them being used for fear & violence, but this gets back to its original meaning! And Beyonce' also gave him the seal of approval with a video thanking him.
Check it out at his YouTube channel! He can sang too!