I mean, you shouldn't mix fairytales with liverwurst and buttermilk.
5 seconds sound clip from the White Christmas (1954) movie soundboard.
You can hear this line at 01:20:00 in the Blu-ray version of the movie.
Quote context
[...]
- I'd rather not discuss last night, if you don't mind.
- There's certainly nothing for you to feel guilty about.
- Look who's talking about guilt.
- I mean, you shouldn't mix fairytales with liverwurst and buttermilk.
- What did you have for lunch today?
- Well, maybe you ought to eat something.
- Why is everybody suddenly so concerned about my eating habits? Why don't people leave me alone...
- I got a lot of details here to take care of.
[...]