Einer spinnt immer (1971)

Master Baker Hugo Haase cannot believe that he is the lucky one who inherited a good fortune. Finally he has the possibility to escape from his little province town and his imperious wife to succeed to his estate in Vienna. But naive Hugo is lost in this big city and soon be taken in by a trickster. The attractive Clarissa invites Hugo to spend a day together in Venice, which leads to an unhappy awakening - Clarissa is vanished ...and the money too. The only solution to explain it to his wife is... the flight into a mental hospital!