This came as a surprise when David Letterman tells Oprah Winfrey that Jay Leno is the funniest guy he’s ever known in a preview from their interview for Oprah’s Next Chapter. Full interview airs next Sunday.

Tagged as: David Letterman, Funniest Guy I've Ever Known, Interview, Jay Leno, Oprah Winfrey, Oprah's Next Chapter, Preview, Rivalry