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Lucille Ball and the chocolate factory; the sitcom that invented the three-camera format.

David Brent at Wernham Hogg in Slough; twelve episodes and a Christmas special that invented the form.

Dunder Mifflin, Scranton; nine seasons of Michael Scott, Jim and Pam.

The show about nothing; nine seasons of Jerry, George, Elaine and Kramer.

Springfield since 1989; the first ten seasons are the ones people mean.

Larry David plays Larry David, improvised, for twelve seasons of social crimes.

The Bluth family after the arrest of the father; the sitcom built for rewatching.

Tina Fey runs a sketch show under Alec Baldwin's executive; the fastest joke rate on television.