How do you know? Oh, how silly of me to ask you that.
5 seconds sound clip from the Champagne for Caesar movie soundboard.
You can hear this line at 00:43:39 in the DVD version of the movie.
Quote context
[...]
- Oh, the high Lama of lather.
- How do you know? Oh, how silly of me to ask you that.
- Well, I can't be expected to do everything.
- I've just had the greatest idea since the discovery of fire.
- I will bathe the world physically and you will cleanse it mentally.
- Together we will bring about a spotless sparkling world, how does it hit you?
[...]