Free Online HD YesMovies. At Praterstern, the controlled fear and adrenaline of the people on the Sausage Prater's roller coasters collides with the media-hyped fear of the Praterstern environment. Serapions Theater uses this very contradiction as the impetus for its film by bringing the two locations together; now, everyday life becomes an attraction: The Praterstern train station halls become a roller coaster ride, and its shop windows become a hall of mirrors.