Curses and Counter-Curses

Curses and Counter-Curses is a book of spells that was written by Vindictus Viridian. Its full title is ''Curses and Counter-Curses (Bewitch your Friends and Befuddle your Enemies with the Latest Revenges: Hair Loss, Jelly-Legs, Tongue-Tying and much, much more).

Harry Potter saw a copy for sale at Flourish and Blotts in 1991 and was intrigued by the thought that it might help him to curse his cousin Dudley. Hagrid dragged him away from it, telling him that he was not allowed to perform magic around Muggles, and that he was still too young to pull off such advanced spells.