One thing you learn at conferences is what a skwirl looks like after random phase shifts.
Now in Budapest, after the night train from Belgrade. The latter city is noted in the Metronomicon* for possessing an underground train network of the simplest possible form, i.e. a single Metro station but no tunnels.
* The blasphemous Book of Naming of Stations was penned by the mad arab Abdul al-Hazmat shortly before he died under conditions both mysterious and unpleasant, being torn apart in the Damascus marketplace by an invisible ticket inspector.