Die U-Bahn-Ratten (1986)

Three rats live on the tracks of a subway station. They are doing splendidly - they live fat and full from the falling trash of the pedestrians. But the rats are seized by wanderlust and they want to sign on in a sailor's pub. Well, the journey to the wide world becomes a flop - no place for rats! Remorsefully they return to "their" subway...