so for the next two hours we sat , rapt , as president of the united states henry fonda clenched his jaw against a coldly crisp black-and-white world gone mad , and a computer foul-up caused the u.s. attack squadron to pass the fail-safe point and bomb moscow , and then poor hank fonda had to clench his jaw some more and order the bombing of new york city to placate the russians and avoid a full-scale nuclear war .