"Sonnets of a Sorcerer - that's not even allowed in Hogwarts!"
-- Scorpius Malfoy (CC1.19)
Sonnets of a Sorcerer is a cursed book of poetry (CS13).
Ron told Harry that everyone who read this cursed book spoke in limericks for the rest of their lives (CS13).
Hermione has a copy of this book in the library in her office (CC1.19).