Help with clip
There's a clip of film that plays near the end of Part 3 where we see an atomic blast and a narrator comes on and says:
"Ladies and gentlemen, this is not the end of our show; however, something very much like this could happen at any moment. We just thought we ought to prepare you and more or less put you in the mood. Thank you, and now back to our story."
I know it's a long shot, but I was wondering if anybody knew what this is from. Can anyone help? [I thought it was pretty impressive.]
I proclaim ignorance in everything I say.