That was quite unintentional, sir.
3 seconds sound clip from the Ruggles of Red Gap (1935) movie soundboard.
You can hear this line at 01:26:32 in the Blu-ray version of the movie.
Quote context
[...]
- I wouldn't say that if I were you, sir.
- I beg your pardon, but you were insulting, sir.
- Not only were you insulting but you were eavesdropping.
- That was quite unintentional, sir.
- I wouldn't say that if I were you, sir. (2)
[...]