Maggie Smith: Professor McGonagall
Ron : [Harry and Ron arrive late to Transfiguration, relieved that Professor McGonagall isn't there yet] Whew, made it. Can you imagine the look on old McGonagall's face if we were late?
[the cat sitting at the head of the class suddenly transforms into her]
Ron : That was bloody brilliant!
Professor McGonagall : Well, thank you for that assessment, Mr Weasley. Perhaps it would be more useful if I were to transfigure Mr Potter and yourself into a pocket watch? That way, one of you might be on time.
Harry : We got lost.
Professor McGonagall : Then perhaps a map? I trust you don't need one to find your seats.
Professor McGonagall : Albus, do you really think it safe, leaving him with these people? I've watched them all day. They're the worst sort of Muggles imaginable. They really are...
Dumbledore : The only family he has.
Professor McGonagall : This boy will be famous. There won't be a child in our world who doesn't know his name.
Dumbledore : Exactly. He's far better off growing up away from all of that. Until he is ready.
Professor McGonagall : Nothing, I repeat, nothing gives a student the right to walk about the school at night. Therefore, as punishment for your actions, 50 points will be taken.
Harry : 50?
[Ron and Hermione also looking shocked, Draco smirking]
Professor McGonagall : Each.
[Harry's mouth drops open]
Professor McGonagall : And to ensure it doesn't happen again, all four of you will receive detention.
Draco Malfoy : [smirk suddenly fades and steps up] Excuse me, professor, perhaps I heard you wrong. I thought you said the four of us.
Professor McGonagall : No, you heard me correctly, Mr. Malfoy. You see, honorable as your intentions were, you too were out of bed after hours. You will join your classmates in detention.
Dumbledore : [walks onto Privet Drive and takes out lights with tool] I should have known that you would be here, Professor McGonagall.
[to Professor McGonagall, who is a cat]
Professor McGonagall : [transforms into a human] Good evening, Professor Dumbledore.
[walks with Dumbledore]
Professor McGonagall : Are the rumors true, Albus?
Dumbledore : I'm afraid so, Professor. The good... and the bad.
Professor McGonagall : And the boy?
Dumbledore : Hagrid is bringing him.
Professor McGonagall : Do you think it wise to trust Hagrid with something this important?
Dumbledore : Ah, Professor, I would trust Hagrid with my life.
[Hagrid appears on a flying motorcycle with baby Harry Potter]
Hagrid : Professor Dumbledore, sir, Professor McGonagall.
Dumbledore : No problems, I trust, Hagrid?
Hagrid : No, sir. Little tike fell asleep just as we were flyin' over Bristol. Try not to wake him.
[gives Harry to Dumbledore and McGonagall]
Hagrid : There yeh go.
Professor McGonagall : Albus, do you really think it's safe to leave him with these people? I've watched them all day, they're the worst sort of Muggles imaginable! They really are.
Dumbledore : They're the only family he has.
Professor McGonagall : This boy will be famous. There won't be a child in the world who won't know his name!
Dumbledore : Exactly. He's far better off growing up away from that, until he's ready.
[puts Harry on the Dursley's front step and looks at Hagrid, who is crying]
Dumbledore : There there, Hagrid, it's not really goodbye after all.
[Hagrid nods, while Dumbledore leaves a letter for the Dursleys on Harry]
Dumbledore : Good luck, Harry Potter.
[the camera shoots to Harry's scar]