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It is not just billboards. One of the things you can find on the website of McDonald’s advertising agency Leo Burnett is that it is putting out broadcast adverts that have the sound of a stomach rumble. I am not quite sure what a stomach rumble sounds like, but apparently it is attractive. They are now getting people’s phones set up with location tracking so that when they are in the close vicinity of a restaurant, the phone plays the sound that people associate with the advert and brings the advert to mind.