Helen: Gort! Klaatu barada nikto.
Klaatu: Perhaps before deciding on a course of action, you'd want to know more about the people here - to orient yourself in a strange environment.
Mrs. Barley: There's nothing strange about Washington, Mr. Carpenter.
Klaatu: A person from another planet might disagree with you.
Mrs. Barley: If you want my opinion, he came from right here on Earth. And you know where I mean.
Mr. Krull: They woudn't come in spaceships, they'd come in airplanes.
Mrs. Barley: I woudn't be too sure about that.
Klaatu: I won't resort to threats, Mr. Harley. I merely tell you the future of your planet is at stake.
Klaatu: You have faith, Professor Barnhardt?
Barnhardt: It isn't faith that makes good science, Mr. Klaatu, it's curiosity. Sit down, please. There are several thousand questions I'd like to ask you.