Oldrich Nový (Pavel Fort)Dana Medrická (Pavlína, Fortova zena)Helga Cocková (Alena, Fortova dcera)Jan Tríska (Robert Forda, Petruv syn)Rudolf Deyl (Reditel)Milos Kopecký (Psychiatr)Josef Beyvl (Predseda obcanského výboru)Jarmila Smejkalová (Ucitelka cestiny)Anne Herendeen (Starenka)Eleonora Leffová (Americanka)Magda Maderova (Magistra)Jirí Schulz (Recepcní)Hermína Sebestová (Cechoamericanka)Eman Fiala (Výcepní)Eliska Hrebícková (studentka Jarmila Krecková)Jan Kotva (student Osner)Ivo Pesák (student Kvapil)Pavel Sladovník (student Rabiska)
Petr and Pavel, two grown-up identical twins, have both devoted their lives to music. The serious Pavel, a music professor in Prague, appreciates nothing but classical music. He is unsympathetic to the growing interest in jazz and modern pop among his students, including his daughter Alena. Petr has moved to the United States a long time ago and, unlike his brother, he has taken up a lighter musical genre. Alena uses her uncle as an example in her arguments with her father until Pavel finally decides to put an end to all written contact with his brother in a rather unusual fashion. He announces to his family that Petr has died, and then sends his brother a note stating that Pavel and his family have died in a tragic accident. After some time, Petr arrives in Prague together with his son. He accidentally discovers Pavel's hoax and the two men have a fight when they meet. They then make up and the reunion celebration leaves them so drunk that Pavel is not able to go to school and cannot teach. Petr replaces his brother and wins the students over with a "witless" song.