This is surely a cat phenomenom! When I arrive home from work, Speedy will sit and watch me scoop the litter box, sometimes tilt her head to one side, and as soon as I can dispose of the scoopings, she is in the box, going to the bathroom, like she has been waiting for a clean box all day! Now I hear Anubis is doing this!Yes. Thankfully he isn't picky. The first thing he did when I poured clean litter in it is poop