Marty Gilbert: A countdown... wait, a countdown to what David?
David Levinson: It's like in chess: First, you strategically position your pieces, and when the timing is right ,you strike. They're using this signal to synchronize their efforts and in five hours the countdown will be over.
Marty Gilbert: And then what?
David Levinson: Checkmate.
Marty Gilbert: Oh, my God. I gotta call my brother, my housekeeper, my lawyer. Nah, forget my lawyer.