I found this promotional stunt in the achieves of a  French site called Marketing Alternatif.   This site is really cool, even though my French is very, very rusty….anyway the campaign was created for Starbucks & Wrigley’s  by BBDO Dusseldorf and uses a style of marketing called TACTICAL MEDIAS.  Tactical medias is primarily for companies who  prefer quality of the contact rather than the quantity, this creates a close connection to the consumer  by incorporating the brands image in his/her every day life.