Auf der Alm, da gibt's koa Sünd' (1974)

A pair of agents are after Professor Solo and the formula he carries on microfilm. The formula shows how synthetic gasoline can be made from rubbish. When one of the agents knocks Professor Solo unconscious with a rifle, the scientist entrusts the microfilm to Josef Sandler, the gas station owner who is there. Sandler takes the film back to his village in his leather trousers and tries to decipher the formula with Sepp Huber, the innkeeper. But neither he, the doctor, nor the pharmacist can decipher the symbols. The two agents arrive in the village and, one by one and in different ways, go after the men’s leather trousers, having heard that the film is hidden in a pair. Meanwhile, the professor is hidden in the pharmacist’s house. Complications arise during window serenades, and eventually Sandler’s niece Claudia is kidnapped and the agent Sally is taken prisoner. During the prisoner exchange, sex takes place, and the agents are eventually arrested. However, both manage to escape. Professor Solo brews the gasoline in the pharmacy. Through a moment of carelessness, the microfilm is destroyed. The highly explosive gasoline concentrate is stolen by the agents and is destroyed in an explosion at the end.