The argument over where New York's worst post office is could go on forever, since they are all pretty much the worst, but one tipster is tossing the 9th Street Post Office of Park Slope into the hat. So angered by the slowness of the establishment, this morning one local (we have our suspicions) turned to the chalk to take out their aggressions. Now, now, let's all take a deep breath and recall when residents rallied for the now-closed Prince Street Post Office, declaring: "The Worst Post Office is Better Than No Post Office!"