There is something wrong with the kitten. Nothing obvious. To the casual observer he is a regular kitten doing regular kitten things like attacking his tail, being bad and looking cute. However, if you are unlucky enough to be around him for any length of time you will soon come to realize that something dark is brewing in the bowels of his being. Literally. This kitten stinks. He emits such revolting odoriferous clouds of funk playing with him becomes an exercise in gag reflex control. Cleaning his litter box of his rank deposits is not so much a kindness to him but a desire to breathe in my own home.
If his smell was a book it would be War and Peace-The Director's Cut. If his stink was a biblical reference it would be the Four Horsemen of the Apocalypse pulling a manure cart. If his stench was a person it would be Hitler with hemorrhoids. If his inner essence was a sandwich it would be Ebola on Rye. His farts could be classified as weapons of mass destruction. The US will be bombing my living room next. And rightly so. I should be charged an environmental fine for illegal emissions. Brain cells die upon inhalation.
He is eating well and getting very high quality food. He's been wormed twice at appropriate intervals. Clearly, I need to get him to a vet for some antibiotics. Maybe he has food allergies.
Next logical step is an exorcism by a qualified priest.