You can't go wrong with this one, sir. I've never heard a sweeter warbler.

3 seconds sound clip from the The Picture of Dorian Gray movie soundboard.

You can hear this line at 00:25:23.169 in the Blu-ray version of the movie.

Quote context

[...]

- You're going away tonight. The ship will take you far away over the dark waters. Don't let me remember you angry and troubled.

- That's better.

- Can't you read what people are in their faces?

- You think I'm silly when I call him Sir Tristan. But to me he's like one of King Arthur's knights that we used to read about when we were children, who took the vow of chivalry to battle against all evil-doers. To defend the right to protect all women.

- To be true in friendship and faithful in love.

- You can't go wrong with this one, sir. I've never heard a sweeter warbler.

- Little yellow bird.

- Late as usual, Harry.

- Please forgive me, Aunt Agatha.

- Punctuality is the thief of time, Harry says.

[...]