Stevenson's most famous moment as UN Ambassador came during the Cuban Missile Crisis in October 1962, when he gave a presentation (covered on national television) at an emergency session of the Security Council.[69] He forcefully asked Soviet UN representative Valerian Zorin if his country was installing nuclear missiles in Cuba, and when Zorin appeared reluctant to reply, Stevenson punctuated with the famous demand "Don't wait for the translation, answer 'yes' or 'no'!"[70] When Zorin replied that "I am not in an American court of law, and therefore do not answer a question put to me in the manner of a prosecuting counsel...you will have your answer in due course", Stevenson retorted, "I am prepared to wait for my answer until Hell freezes over."[70] In one of the most memorable moments in United Nations history, Stevenson then showed photographs (taken by a U-2 spy plane), that proved the existence of nuclear missiles in Cuba, just after Zorin had implied they did not exist.[71]