Professor Albus Dumbledore: Do not pity the dead, Harry. Pity the living and above all, those who live without love.
Harry Potter: We have to go there, now.
Hermione Granger: What? We can't do that! We've got to plan! We've got to figure it out...
Harry Potter: Hermione! When have any of our plans ever actually worked? We plan, we get there, all hell breaks loose!
Molly Weasley: Not my daughter, you bitch!
Harry Potter: You'll stay with me?
Lily Potter: Always.
Sirius Black: Until the end.
Filch: Students in the corridor! Students out of bed!
Professor Minerva McGonagall: They are supposed to be out of bed, you blithering idiot.
Flitwick: You do realize we can't keep out You-Know-Who indefinitely.
Minerva McGonagall: That doesn't mean we can't delay him. And his name is Voldemort, so you might as well use it, he's going to try and kill you either way.
Lord Voldemort: Why do you live?
Harry Potter: Because I have something worth living for.
Ron Weasley: That's my girlfriend, you numpty!
Harry Potter: It seems, despite your exhaustive defensive strategies, you still have a bit of a security problem, Headmaster.
Hermione Granger: We can't just stand here. Who's got an idea?
Ron Weasley: Don't ask us. You're the brilliant one!
Ollivander: He's after you, Mr Potter. You really don't stand a chance.
Harry Potter: I suppose I'll have to kill him before he finds me.
Minerva McGonagall: I've always wanted to use that spell!
Lord Voldemort: Only I can live... Forever.
Luna Lovegood: Harry Potter! You listen to me right now! Don't you remember what Cho said about Rowena Ravenclaw's diadem? There's not a person alive who's seen it. It's obvious, isn't it? You have to talk to someone who's dead.
Harry Potter: Tell them how it happened that night. How you looked him in the eyes, a man who trusted you, and killed him!
Professor Severus Snape: We've kept him alive so he can die at the proper moment.
Harry Potter: Come on Tom, let's finish the way we started. Together!
Harry Potter: I never wanted any of you to die for me.
Professor Albus Dumbledore: You wonderful boy. You brave, brave man.
Professor Severus Snape: We have for some time now considered Mr. Potter's return to Hogwarts as not merely possible, but inevitable.
Chosen answer: Hermione knows this is an unusual request and she and (and Harry) suspect the bank knows that Bellatrix's wand was captured by Harry Potter (at the end of Part 1). Showing the bank manager the real wand would prove that this is not Bellatrix. The bank and Voldemort's minions expected that Harry and the others might go to Gringotts searching for a Horcrux in the Lestrange's vault. They are setting a trap for Harry and his accomplices.
raywest ★
Incidentally, if I remember right, in the book Hermione actually does hand over Bellatrix's wand, not realizing the Gringotts goblins already know the wand is no longer in her possession, forcing Harry to cast a timely Imperius Curse to avoid the entire plan being exposed.