The Tale of Scrotie McBoogerballs
The boys are given one of the most notably banned books of all time as a reading assignment. They eagerly dive in, but soon find it doesn't compare to their standard of what's vulgar. Annoyed for having their time wasted by reading, they write an obscene book of their own to show that they can do it better. But when their parents discover their work, the boys throw all the blame to Butters, inadvertently turning him into a critically acclaimed author.