‘If the war is lost, then it is of no concern to me if the people perish in it.’ Bruno Ganz, who not so much portrays Hitler as becomes him in Bernd Eichinger’s 2004 film Der Untergang (Downfall), spits the Führer’s nihilist venom so convincingly that the fundamental insanity of Nazism is at once laid bare, even to his closest collaborators.