You know, doc, you're right!
5 seconds sound clip from the The Crackpot Quail (1941) movie soundboard.
You can hear this line at 00:03:10 in the Blu-ray version of the movie.
Quote context
[...]
- I thought it might have been a quail.
- No, doc, frr, a quail goes, frr, like this.
- Say, wait a minute. You're a quail.
- You know, doc, you're right!
- Uh-oh!
[...]