Aunt Marge You mustn't blame yourself about how this one turned out, Vernon. It's all to do with blood. Bad blood will out.
Aunt Marge : What is it the boy's father did, Petunia?
Aunt Petunia : Oh, nothing. He didn't work; he was unemployed.
Aunt Marge : And a drunk too, no doubt?
Harry : That's a lie!
Aunt Marge : What did you say?
Harry : My dad wasn't a drunk!
Aunt Marge : Oh, don't worry Petunia. I have a very firm grip.
Sirius Black : Enough talk, Remus! C'mon, let's kill him!
Professor Lupin : Wait!
Sirius Black : I did my waiting! Twelve years of it! In Azkaban!
Professor Lupin : Very well, kill him. But wait one more minute. Harry has the right to know why.
Harry : I know why! You betrayed my parents! You're the reason they're dead!
Professor Lupin : No, Harry, it wasn't him! Somebody did betray your parents, but it was somebody who, until quite recently, I believed to be dead.
Harry : Who was it then?
Sirius Black : Peter Pettigrew! And he's in this room, right now! Come out, come out, Peter! Come out and play!