And you let them go after hearing what they said? Oh, you button-headed little idiot, you!

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

You can hear this line at 00:46:16 in the radio play.

Quote context

[...]

- Thirty-Nine Steps?

- Oh, don't ask me what it means, because I don't know.

- Anything else?

- Well, they said the Professor was clearing out of the country.

- Then he has got the secret!

- Did they say how soon he was leaving?

- No. But they did say that he was going to London first to pick up someone at a music hall.

- Thirty-Nine Steps... London music hall... It doesn't make any sense.

- Which room are these men in?

- Oh, they left.

- When?

- Oh, about four or five hours ago.

- And you let them go after hearing what they said? Oh, you button-headed little idiot, you!

- Don't you speak to me like that!

- My dear girl, I'm accused of murder. The only way I can clear myself is to expose those spies.

- Why don't you go to Scotland Yard?

- What's the use? You said yourself that no one would believe me.

- Well, then why don't I go to Scotland Yard?

- Why not? They'd listen to you.

- Of course they would.

[...]