If you guys are old enough to remember the magazine National Lampoon, there is a very good documentary called
Drunk,Stoned, Brillliant, Dead.
http://www.imdb.com/title/tt1674785/
The film is about National Lampoon magazine, and how the magazine and its empire of spin-offs changed the course of comedy and humor. It's a great story of the magazine was founded with interviews writers, editors artists.
It also has some incredible footage and audio with most of the SNL cast of the 70's and 80's who got their really big breaks when they came over from Second City comedy to NL radio.
For me, it was a tremendous trip down memory lane, learning a great deal about the magazine, its triumphs and its ultimate demise.