I read somewhere once about a study of how couples with a variety of income and education levels communicated. You might expect really educated couples to sit around and talk about deep philosophy or something, but it turned out basically all couples (at least ones that have been together for a while) all talk about extremely mundane shit. Like to the point that most people just blurt out their thoughts as they have them - and it’s not even really a “conversation”.

Stuff like “Wow, this pan is getting really beat up. We should probably get a new one soon.” “Ok. Ugh I just remembered I have to meet my sister for lunch tomorrow.”