Wow...this is one of the better guerrilla attempts I've ever seen. These stickers were placed in elevators to show the floor numbers as the changing weights of passengers. Just imagine someone who is already self-conscious of their weight having to watch that. I think it would definitely leave an impression and motivate someone to get on a diet.
Agency: Duval Guillaume, Belgium
Creative Director: Geoffrey Hantson, Dirk Domen
Copywriter: Kristof Snels
Art Director: Sebastien De Valck
Designer: Niki Desiron