I didn't stop to enquire his last name.
4 seconds sound clip from the The 39 Steps (1937) classic radio play.
You can hear this line at 00:26:09 in the radio play.
Quote context
[...]
- You see, I know who killed Annabella Smith.
- The same man who shot me a few minutes ago.
- Right in the cigarette case. See? There's a hole in one side of it.
- And who was this arch-villain?
- Gentleman called 'The Professor.'
- Professor? Oh, now, you... you don't mean Professor Bartlett?
- I didn't stop to enquire his last name.
- Oh, come now, it isn't as funny as that.
- And you expect them to believe it, I suppose.
- I'm sure the sheriff will be interested in your story.
[...]