My dog has a facial expression strictly for "I shat on the floor while you were at work".
Isn't that cute and unique? What makes it even more adorable is that my floor has a 5 degree incline to it so all of his piss makes a little mudflow winding its way across the room and hitting all the boxes and piles of books and receipts and whatnot until it hits the doorway.
I bought a clorox lazy-people's mop (the no-bucket kind with the stick-on diaper pads) to clean up said piss, and he pissed on that, too. Beautiful, cute, and unique.