He's a man I think you all know.
4 seconds sound clip from the After the Thin Man (1936) movie soundboard.
You can hear this line at 01:36:10 in the DVD version of the movie.
Quote context
[...]
- How much more of this nonsense have I got to endure?
- We hope that this will be the last.
- Aunt Katherine, sit over here.
- Yes, uh... Oh, this must be Dr. Kammer. I've heard so much about you from David.
- Won't you come in and sit down? Just find a chair.
- I asked you all down here because we found another murder had been committed here.
- He's a man I think you all know.
- Yeah. Don't you read the papers?
- Well, what do you know about him?
- Nothing.
[...]