It should be in "Chamber of Secrets": 1) "Gilderoy Lockhart is a narcissistic wizarding celebrity who has written many books on his fabulous adventures encountering dark creatures. In Chamber of Secrets, Lockhart is appointed as Hogwarts' new Defence Against the Dark Arts instructor. In his first lesson, he gives the class a quiz that centers around himself rather than the subject. He is unpopular amongst the staff, particularly Professor Snape. Hermione develops a crush on Lockhart, much to Ron's disgust. Harry dislikes him, in part after Lockhart believes that Harry flew to Hogwarts in a car to seek further attention, and that he was later handing out signed photos of himself. Lockhart is exposed as a fraud when he attempts to avoid entering the Chamber of Secrets by revealing to Ron and Harry that he never performed the amazing feats documented in his books, instead stealing other wizards' experiences and erasing their memories. His attempt to use the Obliviate Charm on Harry and Ron backfires due to his use of Ron's broken wand, and he suffers the loss of his own memory as a result. In Order of the Phoenix, Harry comes across Lockhart in St. Mungo's while visiting Mr. Weasley on Christmas. Lockhart is slowly regaining his memory and childishly proud of being able to write in "joined-up letters." He still receives fan mail, although he has no idea why, and still enjoys signing autographs. Lockhart never fully recovers, despite all efforts to the contrary. He is harmless and guileless, yet still a danger to himself as he wanders aimlessly and cannot remember his identity or his location. Rowling has said that Lockhart is the only character who was directly inspired from a real-life (though unrevealed) acquaintance, and that she "barely exaggerated" in terms of depicting Lockhart's personality." Source and further information: http://en.wikipedia.org/wiki/Gilderoy_Lockhart#Gilderoy_Lockhart 2) ""Now, Professor Dumbledore has granted me permission to start this little dueling club, to train you all in case you ever need to defend yourselves as I myself have done on countless occasions -- for full details, see my published works." -- Gilderoy Lockhart (CS11)" Source and further information: http://www.hp-lexicon.org/wizards/lockhart.html