[on his collaboration with Milos Macourek and Jaroslav Doubrava]: "Working with Milos Macourek was great, and we became close friends in the process. We also worked on some of the films with Jaroslav Doubrava, who was the head animator. For example, we got the idea that in O utrzeném sluchátku (1976), Mach would slide down the railing, and Doubrava thought that he could use his ear as a turn signal. We went with that immediately. It was collective work."
