Leno and Letterman and Seinfeld

With Jay Leno winding down his stint as host of "The Tonight Show" for the second time, Jerry Seinfeld put together some segments of his web series, Comedians In Cars Getting Coffee, that feature both Leno and David Letterman. In it, they discuss each other, their common history, and how easy it is to use "the board of health" as an ad-lib...

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