Osha and Bran Stark in “Unfinished Business”

Osha

You've been having those dreams again.

I don't dream.

Osha

Everyone dreams.

I don't. I heard some of the men talking about the comet. [looks up at said comet in the sky] They say it's an omen. They say it means Robb will win a great victory in the South.

Osha

Did they?

Osha

I heard some other fools say it's Lannister red. Means the Lannisters will rule all Seven Kingdoms before long. I heard a stable boy say it's the colour of blood, to mark the death of you father. [places Bran on the ground] The stars don't fall for men. The red comet means one thing, boy: Dragons.

The dragons are all dead. They've been dead for centuries.