Question: The 1957 Cannes Film Festival opened with what film starring Cantinflas and David Niven?
Sentence (from "Su Excelencia"): Cantinflas portrays Lopitos, a chancellor stationed in his country's (Republica de Los Cocos) embassy in the communist country of Pepeslavia who later ascends to the role of ambassador and has to decide the pivotal vote of joining the "Reds" or the "Greens", therefore deciding the fate of one hundred nations.
Relevant evidence: No