Dangerously Funny by David Bianculli (2009)

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Subtitled: The Uncensored Story of the Smothers Brothers Comedy Hour. Fascinating inside look at the television show that only lasted three years, but had a huge impact on television and comedy. Plus, an interesting look at the culture of the late sixties as viewed through the prism of television, and what wasn't being said on television. The Smothers Brothers themselves are interesting characters, as are the amazing cast that made up their writing and acting teams.  Only a few of the sketches they refer to are available on Youtube.  I hope they're not lost to the ages.