It’s a giant inflatable rubber ducky. Why? There may be no good answer to that question. But, to judge by the crowds at the Point today (the duck’s last weekend in the water), it seems that a giant inflatable rubber duck was just what Pittsburgh wanted. The Port Authority is running double streetcars and Subway Locals (which serve only from Station Square through downtown to Allegheny) to handle the traffic on the subway. Downtown is full of tourists from exotic places like Iowa who came to have their pictures taken in front of the rubber duck. Traffic jams surround the Point. Street vendors are selling bags and bags of rubber ducks. Restaurants downtown are packed. All because of a rubber ducky.