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.

Even the best of friends can fall apart, often all it takes is a minor misunderstanding. That's exactly what happened to two village friends, children finishing elementary school, between whom hostility and suspicion suddenly set in. The mosaic-like plot contains a number of humorous observations, but overall it distances itself from any ambition to deeply affect the mentality of adolescents, much less the countryside.