Einer spinnt immer (1971)

Master baker Haase travels to Vienna to see a notary regarding an inheritance. There, he meets Clarisse, who immediately wants to relieve him of the unexpected windfall. So she persuades Haase to travel to Venice, abandons him, and disappears with the last of the inheritance. Fearing the impending marital dispute, Haase feigns amnesia and ends up in a psychiatric institution.