Based on the story «Baron Munchausen» by E. Raspe. Baron Munchausen can not be satisfied with ordinary boring existance. He is trying to turn the workdays into bright holidays. His wife and son left him, only his beloved Martha understands him. But divorsing his wife and engagement with Martha are possible only after his turning to an ordinary citizen. So, he is a fed-up salesman and a calm family man. He is not interesting either to Martha, or servant Thomas, or himself. So he decided "to revive". But to prove that he is the real Baron Munchausen he decided to fly to the Moon from a gun. And he is going to do it.
Source : www.mosfilm.ru