You don't say

They're going to have a baby? You don't say!

Hey, guess what? There's a country called Brazil! –You don't say.

‘And in fact I found something interesting in the sample of the boy you were talking about. The son of Hole’s girlfriend.’ / ‘My understanding is that their relationship is now a thing of the past.’ / ‘You don’t say? There was something in the blood sample, so I was wondering if there was anything in the family . . .’

A recent article about Barbie in the New Yorker quoted no less a figure than Gerwig’s own agent as saying: “Is it a great thing that our great creative actors and film-makers live in a world where you can only take giant swings around consumer content and mass-produced products? I don’t know. But it is the business.” You don’t say.