Half-Blood Prince clip which aired on Ellen yesterday:

Windows HD: Small, Medium, Large

Windows Standard: Small, Medium, Large

Flash: Small, Large

QuickTime HD: Small, Medium, Large

QuickTime Standard: Small, Medium, Large, Very Large

iPod: Click here

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"An Unbreakable Vow?" said Ron, looking stunned.

"Nah, he can’t have.... Are you sure?"

"Yes I’m sure," said Harry. "Why, what does it mean?"

"Well, you can’t break an Unbreakable Vow..."

"I’d worked that much out for myself, funnily enough."