- And you know, Bruno, there is an old saying.
- What's that?
- Never bullshit a bullshitter.

— Marie Jouvet (Joanna Lumley)

5 seconds sound clip from the Trail of the Pink Panther (1982) movie soundboard.

You can hear this line at 01:09:56.509 in the Blu-ray version of the movie.

Quote context

[...]

- Have a seat.

- Can I have a drink?

- Do I have a choice?

- Actually, no.

- How about some champagne?

- Terrific. And put a fresh peach in it.

- You heard the lady. Some champagne and put a peach in it.

- A peach? Yes, sir.

- I never heard of a peach in champagne before.

- Very sexy.

- Make that two.

- Yes, sir.

- What happens if he doesn't have any peaches?

- Something very melodramatic.

- Well, if it gets to that, I'll settle for plain champagne.

- You know, Marie, you really are some kinda sensational lady.

- And you know, Bruno, there is an old saying.

- What's that?

- Never bullshit a bullshitter.

- I want you to lay off on this Clouseau thing.

- Take off your glasses.

- What for?

- Then I can see what you're thinking.

- I doubt that.

- Why do you want me to lay off Clouseau?

- 'Cause I asked you to.

- It's not a good enough reason.

- It should be.

- What if I don't?

[...]