Smaug: It's Oakenshield. That filthy Dwarvish usurper! He sent you in here for the Arkenstone, didn't he?
Bilbo Baggins: No no no no no, I have no idea what you're talking about...
Smaug: Don't bother denying it! I guessed his foul purpose some time ago! But it matters not. Oakenshield's quest will fail. A darkness is coming. It will spread to every corner of the land!