Not Sure I Should Even Tell This

I'm home today, and cleaning. I cleaned out the upstairs litter box, then set it up on the edge of the bathroom sink while I mopped the floor. While waiting for the floor to dry, I went elsewhere and did other things. When I returned to the bathroom to put the litter box back on the floor - well, you can probably guess: someone had peed in it. (It's amazing that the whole thing didn't go over...)