Despair (1978)

Storyline:
Berlin, 1930, during the rise of Nazism. Hermann Hermann, a Russian emigrant and chocolate manufacturer, married to the capricious Lydia, loses his temper more and more every day when dealing with his workers and other businessmen; until he meets Felix, a vagrant, who seems to be physically identical to him; a disconcerting fact that leads Hermann Hermann to plot a particular way out of a fake world he actually hates.