Harry Potter: It was Malfoy.
Minerva McGonagall: That is a very serious accusation, Potter.
Severus Snape: Indeed. Your evidence?
Harry Potter: I just know.
Severus Snape: You just... know. You astonish with your gifts, Potter. Gifts mere mortals can only dream of possessing. How grand it must be to be the Chosen One.
(Harry and Ron are enjoying watching the students hurrying up to their classes while they have a free period...)
Minerva McGonagall: Potter.
Harry Potter (to Ron): Oh, this can't be good.
Minerva McGonagall: Enjoying ourselves, are we?
Harry Potter: I had a free period this morning, professor.
Minerva McGonagall: So I noticed. I would think you would want to fill it with Potions. Or is it no longer your ambition to become an Auror?
Harry Potter: It was, but I was told I had to get an "Outstanding" in my O.W.L.
Minerva McGonagall: So you did, when Professor Snape was teaching Potions. However, Professor Slughorn is perfectly happy to accept N.E.W.T.s students with "Exceeds Expectations."
Harry Potter: Brilliant. Um... Well, I'll head there straightaway.
Minerva McGonagall: Oh, good, good. Potter, take Weasley with you. He looks far too happy over there.
Alastor Moody: I'll teach you to curse someone when their back is turned! You stinking, cowardly, scummy... back-shooting...
Minerva McGonagall: Professor Moody! What are you doing?
Alastor Moody: Teaching.
Minerva McGonagall: Is that a...? Is that a student?
Alastor Moody: Technically, it's a ferret.
Minerva McGonagall: Put an end to it. Don't let Potter compete.
Albus Dumbledore: You heard Barty. The rules are clear.
Minerva McGonagall: Well, the devil with Barty and his rules. And since when did you accommodate the Ministry?
Severus Snape: Headmaster, I, too, find it difficult to believe this mere coincidence. However, if we are to truly discover the meaning of these events... perhaps we should, for the time being... let them unfold.
Minerva McGonagall: What...? Do nothing? Offer him up as bait? Potter is a boy, not a piece of meat.
Severus Snape: A girl has been snatched by the monster, Lockhart. Your moment has come at last.
Gilderoy Lockhart: My moment?
Severus Snape: Weren't you saying just last night... that you've known all along where the entrance to the Chamber of Secrets is?
Minerva McGonagall: That's settled. We'll leave you to deal with the monster, Gilderoy. Your skills, after all, are legend.
Gilderoy Lockhart: Very well. I'll just be in my office getting... Getting ready.
Hermione Granger: Professor... I was wondering if you could tell us about the Chamber of Secrets.
Minerva McGonagall: Very well. You all know, of course... that Hogwarts was founded over a thousand years ago... by the four greatest witches and wizards of the age: Godric Gryffindor, Helga Hufflepuff... Rowena Ravenclaw and Salazar Slytherin. Now, three of the founders coexisted quite harmoniously. One did not.
Ron Weasley (to Harry): Three guesses who.
Minerva McGonagall: Salazar Slytherin wished to be more selective... about the students admitted to Hogwarts. He believed magical learning should be kept within all-magic families. In other words, pure-bloods. Unable to sway the others, he decided to leave the school. Now, according to legend... Slytherin had built a hidden chamber in this castle... known as the Chamber of Secrets. Though, shortly before departing, he sealed it... until that time when his own true Heir returned to the school. The Heir alone... would be able to open the Chamber... and unleash the horror within, and by so doing... purge the school of all those who... in Slytherin's view, were unworthy to study magic.
Hermione Granger: Muggle-borns.
Minerva McGonagall: Well. Naturally, the school has been searched many times. No such chamber has been found.
Hermione Granger: Professor? What exactly does legend tell us lies within the Chamber?
Minerva McGonagall: The Chamber is said to be home to something... that only the Heir of Slytherin can control. It is said to be the home... of a monster.
Minerva McGonagall: Albus, do you really think it's safe, leaving him with these people? I've watched them all day. They're the worst sort of Muggles, imaginable. They really are...
Albus Dumbledore: The only family he has.
Minerva McGonagall: This boy will be famous. There won't be a child in our world who doesn't know his name.
Albus Dumbledore: Exactly. He's far better off growing up away from all of that. Until he's ready.