Gripping tale of what happened to the kidneys of a boy who ate 25 laxative brownies

A dumb teenage laxative-devouring competition ended in tears; also in low blood potassium, massive dehydration, crippling headaches, and the transformation of the victim's body into a toxic waste dump: "If your kidney doesn't function, your body, down to its bones, will rot away and eventually you'll die in a pool of your own waste that should have been your urine".

Here's an illustration of what was left of his kidneys.