Old Billy: I often thought about looking for you before tonight. Apparently, it would have torn a hole in the fabric of space and time and destroyed two-thirds of the universe. Also… I'd lost my hair
Sally: Two-thirds of the universe? Where'd you get that from?
Old Billy: There's a man in 1969. He sent me with a message for you.
Sally: What man?
Old Billy: The Doctor.
Sally: And what was the message?
Old Billy: Just this: 'look at the list'.