Butters takes credit for writing "The Tale of Scrotie McBoogerballs" after the boys try and pass the blame to them.
Added:

South Park Season 14 Episode 2 Quotes

Are you telling us this book is filthy, inappropriate, and made a guy shoot the king of hippies? Can we read it right now?

Cartman [about Catcher in the Rye]

And Matthew, how come a transvestite donkey witch is standing next to you and wearing a dress?

Reporter [to Matthew Broderick about Sarah Jessica Parker]