What is your go to content-free response?

A coworker and I are collecting content-free responses. The sort of thing you might say when a crazy person says something to you and you don't want to set them off by disagreeing, but don't really want to agree either. Things like, "whatcha gonna do?" or "it is what it is" or "yeah, I hear ya"

We have a ton of meetings at work, and we've decided to try to go meeting or meetings at a time saying nothing but these sort of things, void of meaning.

So - what are your best content-free responses?