David Letterman spent 10 minutes on his show last night explaining in detail (sort of) an extortion threat made against him to expose a series of inter-office sexual affairs. And so naturally someone has uploaded a Zapruder Film of the entire thing (what is it this week with Zapruder Films? Or is it Zapruders Film?): [videoembed size="full_width" alignment="center"][/videoembed] Now look, ...