If you'd rung me up and asked me were you fair or dark or had a moustache, I wouldn't have known.
6 seconds sound clip from the The Third Man (1949) movie soundboard.
You can hear this line at 01:03:09.251 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, please. For heaven's sake, stop making him in your image.
- Harry was real. He wasn't just your friend and my lover. He was Harry.
- Well, don't preach wisdom to me.
- You talk about him as if he had occasional bad manners.
- No. I don't know. I'm just a hack writer who drinks too much and falls in love with girls... You.
- Me?
- Don't be such a fool. Of course.
- If you'd rung me up and asked me were you fair or dark or had a moustache, I wouldn't have known.
- Whoever killed him, there was some sort of... justice. Maybe I would've killed him myself.
- A person doesn't change because you find out more.
[...]