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This not a digital campaign (although is now viral) but I just HAVE to share it with you. Inspired by the T-mobile Liverpool Street stunt of course.
Experiential Marketing at its best: sponsored by TAP air Portugal and Infraero (Brazil airports) they have made a celebration for the day of Rio de Janeiro's patron saint São Sebastião.
500k viewers in one month on YouTube and still going strong - I'd say its a very successful piece of work.