Because when you're not there, I can be more free with my language, that's why.

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

You can hear this line at 01:29:11 in the Blu-ray version of the movie.

Quote context

[...]

- Yes, please go. There is no need for you to wait. It's just the monthly accounts I have to settle.

- You'd be very pleased if I left, wouldn't you?

- Then you'd be able to keep that London deal from me.

- What London deal? I don't know what you're talking about.

- Then why do you want me to go?

- Because when you're not there, I can be more free with my language, that's why.

- And Mr Topaze badly needs a dressing-down.

- Why?

- Why? Because he's getting damn cheeky, our schoolteacher.

- And it's all your fault! Yes, your fault, right from the beginning.

[...]