Headmaster, there is no mistake.
4 seconds sound clip from the Mr. Topaze (1961) movie soundboard.
You can hear this line at 00:36:31 in the Blu-ray version of the movie.
Quote context
[...]
- Oh! Well, I can assure you that Mr Topaze will get his medal at the very first opportunity.
- Oh! Do you hear? The Baroness says you will get your medal at the very first opportunity.
- Madam, I I don't know how to thank you.
- Headmaster, there is no mistake.
- Now, let us be logical about this.
- Madam, I assure you there cannot possibly be a mistake.
- Here he had another nought yesterday for mathematics.
[...]