As fans well know, 'Breaking Dawn, Part 1' ends on a bit of a cliffhanger, but don't bolt for the exits when the credits start: There's a bonus scene that teases a major conflict in 'Part 2,' as Peter Facinelli (Carlisle Cullen) tweeted earlier today. What's the scene in question? Hint: you've actually seen a chunk of it in the trailer. MAJOR SPOILERS AHEAD!