In the projection hall at the Film Archives Dr Lorenc chooses clips for a symposium on laughter in film. Driver Jonás has been commissioned to take the selected films together with their card indexes to the Zemec château, where the symposium is taking place. Jonás has a weakness for women but only on the film screen and when he drives by a young and attractive hitchhiker he doesn't give her a lift. He is soon distracted from his driving by a song. To his dismay, he realizes that the hitchhiker girl he refused to take on is sitting on the back of his car, singing and making paper swallows out of the index cards, which she then throws out into the wind. Jonás is horrified, since the film boxes only have numbers and without the index cards the symposium will be at risk.
