- It's your imagination.
- It's not my imagination. I heard a car.

5 seconds sound clip from the The 39 Steps (1937) classic radio play.

You can hear this line at 00:36:41 in the radio play.

Quote context

[...]

- All right. You don't mind if I stretch out in the chair, do you?

- No, not at all.

- Thank you.

- Ho ho, good night.

- Good night.

- I don't see how you can sleep at a time like this.

- Hmm?

- I said, I don't see how you can sleep at a time like this.

- I'm hardened to it. That's all. A hardened criminal will sleep any time.

- Listen. Listen, did you hear that? There's a car out there. It just drove up. A car.

- It's your imagination.

- It's not my imagination. I heard a car.

- Oh, all right, if you don't care...

- Don't care. Just don't care.

- Ooh! Don't do that!

- What's the matter with you anyway?

- Oh, I'm so sorry. You musn't get frightened. I have awful nightmares. I guess it's my conscience bothering me. Good night!

[...]