You're kidding', aren't you?
3 seconds sound clip from the The Day the Earth Stood Still (1954) classic radio play.
You can hear this line at 00:17:17 in the radio play.
Quote context
[...]
- Oh. Well, that's Professor Barnhardt, I guess.
- He's the greatest scientist in the world. He lives right here in Washington.
- Right near where my mother works.
- Where is that? Department of Commerce. She's a secretary. Why?
- I have an idea, Bobby. Let's go see Professor Barnhardt.
- You just said he's the greatest man in America.
- You're kidding', aren't you?
- Wouldn't you like to meet him?
- Aw, go on. I bet you'd be scared.
- Maybe we can scare him more than he can scare us.
- I like you, Mr. Carpenter. You're a real screwball.
- Gee, maybe the professor isn't at home.
[...]