Lakie 1 was a roller. You name it, he rolled in it. Horse poo is fine, it brushes out and leaves very little smell, but human poo is beyond disgusting. He even managed to get it IN his ears. Fox shit was a regular treat.
He dug up a long dead fish on a Cornish beach and rolled on it, which was pretty gross. The smell was still discernible at the end of the holiday. The worst was when he rolled in a puddle of liquid which had seeped out of a slurry heap or similar. It took lots of the ketchup treatment and 5 baths with scented shampoo to reduce the stench to tolerable levels.
When we got Lakie 2, they soon learned to play tug-of-war together. Which was pretty innocuous, until they discovered that (live) slow worms make great tuggy toys.
Being female, she's nowhere near as disgusting, but in her youth would kill and eat rabbits. Then vomit them back up again. The worst thing she did was kill a hedgehog. I found it in the garden, and still haven't quite forgiven her 10 years later.
I've had 2 disgusting cats, too. One would bring in live birds (I'm bird phobic) that then shat all over the place, while the other went for mice. He would eat the top half of the mouse, and leave the bottom half intact, on the stairs. His record was 4 pairs of mouse trousers in one night. Of course, I stepped in 2 of them. Mouse entrails on bare feet is no way to start the day.