(I'm not assuming everyone liked the trailer, for the record. Believe me, some people did not.)
My favorite bit(s) would have to be when Charlie received the invitation (He looked so confused!), when Jacob turned into a wolf, the gorgeous scenes of Rio, when Bella whispered, "That's impossible.", when Edward's face was priceless when she said that (His face just screamed, "Sugar honey iced tea!"), and.... I feel so weird saying this.... the honeymoon scenes. There. I said it. I somewhat enjoyed the honeymoon scenes.
So what is your favorite part of the teaser trailer of The Twilight Saga: Breaking Dawn Part I?
Wow, that title is a mouthful to say aloud. Try saying it aloud in a British accent or in a whisper. I dare you.... Just kidding.