Comedians In Cars Getting Coffee by Jerry Seinfeld  
http://www.imdb.com/title/tt2314952/
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S00E48: Paley Center Screening Room with Jerry and Dave
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Video Description: Hosted by David Letterman.  Jerry and Dave chat onstage for an hour discussing Comedians in Cars Getting Coffee and other topics.  Invite to the event appears on the Paley website as:

Jerry Seinfeld will present a fourth-season episode of his smash web series Comedians in Cars Getting Coffee, a uniquely personal and intimate look at comedy and life with such luminaries as David Letterman, Tina Fey, and Chris Rock. Jerry will discuss the production of this compelling and hilarious project, but unfortunately coffee is not allowed in the theater. Feel free to arrive in a fabulous vintage automobile, though.
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Video Info:
Format            : MPEG-4 at 1,154 Kbps
Length            : 538 MiB for 1h 5mn 13s 165ms
Video #0          : AVC at 1,024 Kbps
Aspect            : 624 x 350 (1.783) at 29.970 fps
Audio #0          : AAC at 128 Kbps
Infos             : 2 channels, 44.1 KHz
Language          : en