An interesting ambient marketing idea for Carlsberg beer. £5000 in £10 and £20 notes were individually dropped in various parts of London with a removable sticker that read "Carlsberg don’t do litter. But if they did it would probably be the best litter in the world". What kind of print ad could Carlsberg have bought for £5000? Not that much really.
What about the USA? 5000 $1 bills would really get your message spread out.
agency: Saatchi&Saatchi, London