During the Super Bowl, Dodge hawked pickup trucks by using the voice of Martin Luther King.
As Phil Klinkner points out, King actually used the speech to denounce advertising, specifically auto advertising. "The Drum Major Instinct," February 4, 1968:
Now the presence of this instinct explains why we are so often taken by advertisers. You know, those gentlemen of massive verbal persuasion. And they have a way of saying things to you that kind of gets you into buying. In order to be a man of distinction, you must drink this whiskey. In order to make your neighbors envious, you must drive this type of car. (Make it plain) In order to be lovely to love you must wear this kind of lipstick or this kind of perfume. And you know, before you know it, you're just buying that stuff. (Yes) That's the way the advertisers do it.
I got a letter the other day, and it was a new magazine coming out. And it opened up, "Dear Dr. King: As you know, you are on many mailing lists. And you are categorized as highly intelligent, progressive, a lover of the arts and the sciences, and I know you will want to read what I have to say." Of course I did. After you said all of that and explained me so exactly, of course I wanted to read it. [laughter]
But very seriously, it goes through life; the drum major instinct is real. (Yes) And you know what else it causes to happen? It often causes us to live above our means. (Make it plain) It's nothing but the drum major instinct. Do you ever see people buy cars that they can't even begin to buy in terms of their income? (Amen) [laughter] You've seen people riding around in Cadillacs and Chryslers who don't earn enough to have a good T-Model Ford. (Make it plain) But it feeds a repressed ego.
You know, economists tell us that your automobile should not cost more than half of your annual income. So if you make an income of five thousand dollars, your car shouldn't cost more than about twenty-five hundred. That's just good economics. And if it's a family of two, and both members of the family make ten thousand dollars, they would have to make out with one car. That would be good economics, although it's often inconvenient. But so often, haven't you seen people making five thousand dollars a year and driving a car that costs six thousand? And they wonder why their ends never meet. [laughter] That's a fact.