Seriously my new favorite episode of Numb3rs.
(Which, yes, is not a book. I realize this. But I'm feeling conflicted about the last book I read and don't want to review it. So there.)
McGill (conspiracy theory nut), Colby and David are on the rooftop of a building.
McGill runs to the rail and looks over.
Colby: "Watch yourself buddy."
McGill: "Oh don't worry about me, I won't fall."
Colby: "If I push you, you will."
I love that scene.