Sadly I have no photos of these events, but I thought you might enjoy the story...
On Wednesday evening, my sister and I were watching a movie when Melly strolled across our laps. My sister watched her pass and commented, "there's stuff on her butt."
Stuff on her butt. Great.
I hauled Melly into the bathroom, filled the tub part way with water, and proceeded to soak her lower half. She protested so loudly and vehemently that my sister mistook her meows for a child crying outside. Unfortunately, despite my vigorous swooshing, the poo adhered to Melly's fur would not come loose, so while I held Melly still and half-submerged, my sister stepped in to help. She grabbed some paper towels and attempted to dislodge the poo but this proved fruitless and we eventually had to sacrifice a washcloth in the pursuit of a clean cat derriere. By this time, Scarlett had also joined us in the bathroom and was watching the proceedings with interest.
After ascertaining that Melly's posterior region was thoroughly clean, we released her from the tub and toweled her off, although not before dissolving into giggles at the sight of her. Melly's front half was as fluffy as usual, but her entire back half was reduced to about half its usual volume--and her usually-proud plume of a tail was a scrawny rope.
When we finally dried Melly off and let her leave the bathroom, which she did in a huff, my sister wondered aloud why it is that we always end up washing cats together.