I don't know how he thinks them up.

4 seconds sound clip from the Breakfast at Tiffany's movie soundboard.

You can hear this line at 00:41:49 in the Blu-ray version of the movie.

Quote context

[...]

- Goodbye, Uncle Sally.

- Goodbye and don't forget to send that book, eh?

- I won't.

- What about the weather report?

- Oh, yes. Snow flurries expected this weekend in New Orleans.

- Snow flurries expected this weekend in New Orleans? Isn't that just the weirdest? I bet they haven't had snow in New Orleans for a million years.

- I don't know how he thinks them up.

- Moon River wider than a mile, I'm crossing you in style some day.

- Oh, dream maker, you heartbreaker. Wherever you're going, I'm going your way.

- Two drifters off to see the world.

- There's such a lot of world to see.

[...]