My cat Casey waits until I come home to poop in the litter box so it is
cleaned up right away.  This week, I came home Tuesday and he walks
over to the litter box which was soiled (I assume his brother did it).
The litter box is in a walk-in closet/room.

Casey sat by the box and looked up at me as I walked by hanging up
clothes,etc.  He looks at me and Meows.  I keep doing what I have to do
and all the time he is sitting by the litter box waiting for me to pass
by, and when he gets my eye, he Meows just a little longer and louder.
You know... the meow when they open their mouth so wide their eyes
close.

Finally, I get the point and clean it out.  He proceeds to step in and
"do his business."