Dear sweet Abelard really is trying his best to use the litterboxes, but I
unwittingly gave him too great of a challenge.

I have a box of Walmart's "Special Kitty" brand scoopable litter and used
most of it to fill a couple of boxes, and there was a few inches of litter
still in the box, which I left sitting on the floor between the litterboxes.

Inside the cardboard box containing the litter is a plastic bag, which I
also did not close. And this morning when I picked up the Special Kitty box
to add some to one of the litterboxes (amazing how much they use now that
they can't go outside), I found a yellow puddle on top of the plastic bag.

There's no question as to who left the puddle. Bless his little heart!