Luna Lovegood : Harry, wait, I need to talk to you.
Harry Potter : I'm a bit preoccupied at the moment, Luna.
Luna Lovegood : You won't find it where you're going, you're wasting your time.
Harry Potter : We'll talk later, ok?
Luna Lovegood : Harry!
Harry Potter : Later!
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 whose seen it. It's obvious isn't it? You have to talk to someone whose dead.
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From: Harry Potter and the Deathly Hallows: Part 2 (2011)