Harry Potter and the Prisoner of Azkaban2003

Harry:
[about Ron's rat missing a toe and being Peter Pettigrew] All they could find left of Pettigrew was his...

Sirius:
Finger! But then the coward cut it off so they would think he was dead! And then he transformed into a rat!

Harry:
Show me.

[Sirius tries to take the rat from Ron, but Ron holds onto it]

Harry:
Give it to him, Ron.

Ron:
What are you trying to do to him?

[Sirius finally gets a hold of the rat]

Ron:
Scabbers! Leave him alone!

[tries to run toward Sirius, but Hermione holds him back]

Ron:
Get off him! What are you doing?

[Sirius drops the rat, which runs while Sirius finally transforms it into Peter Petitgrew]

Peter Pettigrew:
[realizes he's not a rat anymore] Remus? S-Sirius? My old friends!

[runs toward the door, but Lupin and Sirius block him]

Peter Pettigrew:
Harry! Look at you!

[walks toward Harry]

Peter Pettigrew:
You look so much like your father! Like James! We were the best friends...

Sirius:
How dare you speak to Harry!

[Pettigrew scowls and runs away from Sirius]

Sirius:
How dare you talk about James in front of him!

Professor Lupin:
You sold James and Lily to Voldemort, didn't you?

Peter Pettigrew:
I didn't mean to! The Dark Lord. You have no idea the weapons he possesses! Ask yourself, Sirius! What would you've done? What would you've done?

Sirius:
I would have died!

[Pettigrew crawls under piano]

Sirius:
I would have died rather than betray my friends!

Peter Pettigrew:
[runs over to Harry, whispering to him] Harry, James wouldn't have wanted me killed! Your dad... your dad would have spared me! He would shown me mercy...!

[Lupin and Sirius yank him off Harry]

Sirius:
Should've realized, Peter, that if Voldemort didn't kill you, then we would!

[he and Lupin pull out their wands and point them and Pettigrew]

Sirius:
Together!

Harry:
No!

Professor Lupin:
Harry, this man is...

Harry:
I know what he is. But we'll take him up to the castle.

Peter Pettigrew:
Bless you, boy! Bless you!

[kneels to Harry]

Harry:
Get off! I said we'll take you to the castle. After that, the dementors can have you.