And he brings her the milk and she drinks down every drop of it and she looks at her son, calls him over and says: 'Son, whatever you do don't sell that cow.'

18 seconds sound clip from the Bonnie and Clyde (1967) movie soundboard.

You can hear this line at 01:05:31 in the Blu-ray version of the movie.

Quote context

[...]

- Well, now, you two must be in love, I bet, huh?

(RIFLE CLICKS)

- Now, boy, when you gonna marry the girl?

(BUCK CACKLING)

- So he gave her the milk, see, and she drank a little of it. The next day, he gave her some more and she drank a little more till one week goes by, see?

- And he brings her the milk and she drinks down every drop of it and she looks at her son, calls him over and says: 'Son, whatever you do don't sell that cow.'

- I'm from Wisconsin originally. Where the cheese comes from.

- Oh, oh, but he just loves Texas now. Don't you, Eugene?

- Don't sell that cow.

- Hey, how old are you, honey?

- I'm 33.

[...]