You ride around the country with him in a car, but you don't know him? Of course you don't. Keep your mouth shut!
9 seconds sound clip from the The 39 Steps (1937) classic radio play.
You can hear this line at 00:27:47 in the radio play.
Quote context
[...]
- Right you are. Put out your hand! There we are.
- Now put the other one on the girl.
- We are handcuffin' ye to your friend here. Any objections?
- Listen, you can't do this. I don't even know this man.
- All right, Joe. Take 'em to our car. It's a good day's work for us.
- Officer, must I be chained to this man?
- Aye, ye must. And keep quiet aboot it!
[...]