One of the markers of the 70's was the great renaissance in film within the studio system, and Paddy Chayefsky's Network is in the pocket.
I'm writing about it now because it was just recently screened on cable, and even though I've seen it at least ten times I never cease to marvel at it. On every level it's remarkable and so in your face with its prescience. When you consider the theme Chayefsky talks about and the way he pulls back the wizard's curtain it's a wonder that it even got made.
Courtesy of the great Sidney Lumet, sadly, one of the last of a dying breed, here's one of Peter Finch's/Howard Beale's famous rants