About the only noise worse than all of the above happening at the same time, is when NONE of them are happening.
That's when full panic mode sets in. At least when the kids are fighting, screaming, breaking things, or whining, you know where they are and if they are relatively OK.
But what about when it's all quiet? Too quiet?
An immediate investigation must begin to discover what in the world they are doing that they should not be doing.

One day a few weeks ago, there was no Phoebe noise. NONE. Upon immediate investigation, I found her outside, all alone, pacing back and forth across the dirt/weed/thorny desert we call our backyard.
Carrying a black and white striped sock.

For a split second I felt guilty about assuming she was up to no good. Sometimes assumptions are just wrong.

I looked them up and found out what they are, but now I can't remember nor find them again on the internet. But they are some type of ground snail that can be found the world over, which prefer dry, hot climates, and evidently has found nirvana in our backyard.

She carries that sock around all the time, sleeping with it, and even taking it with her on our camping trip to Big Bend. Her shells get around!
So now when the house is too quiet and Phoebe is MIA, I can usually find her shell-hunting in the backyard.
Or secretly putting on my make-up, eating a forbidden lollipop, while hiding my my closet.