Best she not join him in agitation and distress, they could create a feedback loop of intensifying emotions that produce nothing but loud, awful sounds.

"Of course there was more. I just listed the highlights! Sans has the projector right now. I think." He scowls at her a moment before continuing pacing and recounting the increasingly minute details. "I drank two glasses of milk to go with lunch... for healthy bones! Plus I've been housecleaning. With Sans back, there's more messes. Normally that's annoying, and I don't clean up after him... But listening to music makes it a lot easier to not be annoyed with him!"

That was a delightful discovery, especially since his sticky notes didn't make the trip to Vista City. Getting worked up every time Sans didn't deal with his messes was a waste of perfectly good time and energy.