Madam, I can vouch for the complete integrity of my colleague.

5 seconds sound clip from the Mr. Topaze (1961) movie soundboard.

You can hear this line at 00:38:14 in the Blu-ray version of the movie.

Quote context

[...]

- No, madam, I would not deny there is a boy of that name.

- What is his father's profession?

- I have no idea, ma'am.

- The father of this boy Gigon is an excavating engineer. In the garden of this boy's house, there is a rectangular ditch. The problem was chosen to favour Gigon.

- Madam, this is the first time that anyone has ever doubted my integrity which is unimpeachable, madam, which is unimpeachable.

- Madam, I can vouch for the complete integrity of my colleague.

- I hope that I can believe you.

- But I will not believe that my grandson was bottom of the class!

- Will not believe he was bottom of the class

- But Madam, that is a fact.

[...]