The problem was a sort of labyrinth in which two workmen were digging a rectangular ditch.

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

You can hear this line at 00:37:28 in the Blu-ray version of the movie.

Quote context

[...]

- And why is he basically incapable of understanding the problem?

- I will tell you!

- The Baroness will tell you.

- My grandson does not understand the problem because the whole thing is pre-arranged.

- Pre-arranged.

- The problem was a sort of labyrinth in which two workmen were digging a rectangular ditch.

- I shall say no more.

- The Baroness will say no more.

- Madam, having made such an accusation, you must say more.

- Please control yourself.

[...]