The night before Harry, Ron, and Hermione go back to Hogwarts, Mr. Weasley is called back into the Ministry.
Someone named "Mad-Eye" has gotten into trouble with his Muggle neighbors for disturbing the peace.
Mad-Eye claims there was an intruder near the house, but his booby-trapped trashcans exploded and scared the intruder off.
Amos Diggory begs Mr. Weasley to go over there and smooth everything over, since "Mad-Eye's supposed to be starting his new job today" (11.20).
The Weasley family starts talking about Mad-Eye Moody: George thinks he's a "nutter" (11.31) – in other words, crazy.
But Mrs. Weasley reminds them all, "Your father thinks very highly of Mad-Eye Moody" (11.32).
Moody is a retired Auror. (An Auror is a Dark wizard catcher.)
But after catching so many evil wizards, "he's been getting really paranoid in his old age. Doesn't trust anyone anymore" (11.38).
The next morning, the whole family (minus Mr. Weasley and Percy but plus Harry and Hermione) pile into taxis to go to the train station.
Ginny, Harry, Hermione, Ron, Fred, and George say good-bye to Mrs. Weasley, Bill, and Charlie before getting on the Hogwarts Express.
Both Charlie and Bill hint that "You're going to have an interesting year" (11.53).
But they refuse to explain their hints about what's coming to Hogwarts.
On the train, Hermione overhears Draco boasting, "Father actually considered sending me to Durmstrang rather than Hogwarts" (11.69).
Durmstrang is another European wizarding school. It has a reputation for emphasizing the Dark Arts.
Hermione explains that both the other major wizarding schools in Europe – Beauxbatons and Durmstrang – are kept in hidden locations "so nobody can steal their secrets" (11.77).
Ron starts telling all their Gryffindor school friends about the Quidditch World Cup.
Draco Malfoy walks by and start jeering – he catches sight of Ron's dress robes in his trunk and exclaims, "Weasley, you weren't thinking of wearing these, were you? I mean – they were very fashionable in about eighteen ninety ..." (11.102).
Malfoy is also delighted to find out that Ron doesn't know what's coming to Hogwarts.
Malfoy knows because "[his] father told [him] about it ages ago ... heard it from Cornelius Fudge" (11.109).