Why do people buy motorcycles? Is it the connection to the environment? The low cost and high performance potential? No, it's because of this.
When you're lined up at a stoplight, you can just hop off your bike and start dancing if the mood strikes you. Way easier on a bike than in a car.
CarScoops points out that this is probably around the Virginia area, so if you happen to see a dancing motorcyclist down there, you know who it is.
Score one for motorcycle-riding traffic dancers. You win this round.