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This tale is about young Ludvik (Robert Nespor) an erstwhile, budding scientist whose practical sense leads him to experiment before his common sense has figured out the results. Due to that unfortunate pattern, he variously floods the bathroom while working on displacement of volume and weight in water, he shatters the harvest pumpkins but not the law of gravity, and now he is eyeing the neighbor's rabbits for an electricity experiment. While the rabbits remain safe for awhile, Ludvik's parents wish he would follow in their more traditional footsteps and dedicate himself to music. Instead, Ludvik has learned that the proper mixture of a certain carbide and water can be explosive, and while he works on that technique, a friend tips off the physics teacher about these potentially disastrous plans.
Robert Nešpor
Ludvík

Mahulena Bočanová

Jiří Hálek
Lumír

Lubor Tokoš
Matěj
Oldřich Slavík

Zdena Hadrbolcová

Václav Babka
Zdeněk Blažek
Buchtele

Daniel Dítě
Učitel
Roman Pravec
Plichta

Jana Gazdíková
Filip Váp
Jolana Mikesková
Soňa Pavelková
Alice Hlobílková
Jiřičná