Movies that use the background to create an “off”, unsettling feeling?

My best example of what I’m talking about is in Midsommar. In the background of a lot of scenes, the people will be moving, or not moving, in ways that are unsettling, as a normal dialogue is taking place in the forefront.

It’s a great technique for a horror movie that takes place in the sunlight. I want to study other movies that use this technique, if there are any worth watching for it?