At the "Pupky" station, an opportunity occurs: two illegal passengers - guinea pigs - have to be disembarked from one of the trains, since animals cannot be transported in a general carriage. The head of the station Pryvychkin tries to help the animals, but the situation is beyond his control. The audit committee sets out to investigate the unpleasant incident... This witty satirical comedy, in which bureaucracy, bourgeoisie and provincialism are mocked, continued the development of the domestic comedy genre in Ukrainian Soviet cinema.