Killing us softly 3
This links to google video so you can watch the documentary online for free. Its not that long and quite engrossing without being overly intellectual (by that I mean its not filled with boring long words and numbers, its real life examples we can all related to.)
We all like to think we are immune to advertising, but since there is no avoiding it how he can we claim that none of its messages have entered our psyche and become a part of who we think we should be. When you consider that most people spend more time watching TV than interacting with other people on a face to face basis the idea of advertising and its insidious messages influencing us is not so unbelievable.