Rory Sutherland is quite simply a legend in Advertising. Here is his speech at TED on his favourite topic - creating additional worth through merely changing people's perceptions of things. I met him when I was a student and he gave a similar talk about advertising's ability to make people happier. Just use it to make people feel like they have got something good. One of his examples was the NHS. Rory pointed out that the NHS was a great institution, a great thing that suffered from a lack of positive branding and marketing. It is more a problem with perception than reality he said.
Now the British love moaning about the NHS. But as soon as America starts slagging it off then suddenly there are twitter groups and facebook groups springing up all over the place with "We love the NHS" on it. If this was a marking ploy it couldn't have been better. It compares quite well to Rory's example of the spread of the potato.
Even if you're not interested in advertising, Rory is a brilliant talker and thinker and funny to boot. Go on watch it.