Ha ha. I don't believe you.
3 seconds sound clip from the The 39 Steps (1937) classic radio play.
You can hear this line at 00:30:33 in the radio play.
Quote context
[...]
- Meanwhile, I'll admit that you're the white man's burden.
- Oh, yes, I know, and I can't tell you how it comforts me.
- Why don't you give yourself up?
- To whom?
- Oh, give yourself up to Scotland Yard.
- Thank you, but it's a little impractical at the moment.
- Listen to me. I told you the truth on the train and I'm telling it to you now.
- There's a dangerous conspiracy against this country and I'm the only man who can stop it.
- And you're manacled to a murderer who would stop at nothing to get you off his hands.
- If that's the story you prefer, have it, my lovely, and welcome.
- Well, I'm not afraid of you.
- Why not? For all you know, I murdered a woman.
[...]