[the night before the Elves are set to attack Erebor, Bilbo brings the Arkenstone to Thranduil's tent]
Thranduil: The King's Jewel...
Bard: And worth a King's ransom... how is this yours to give?
Bilbo Baggins: I took it as my one-fourteenth share of the treasure.
[Gandalf suppresses a smile]
Bard: Why do this? You owe us nothing.
Bilbo Baggins: I'm not doing it for you. I know that dwarves can be obstinate and pigheaded and difficult. They're suspicious and secretive, with the *worst* manners you can possibly imagine. But they are also brave and kind, and loyal to a fault. I've grown very fond of them, and I would save them if I can.