(Video Link)
The ad agency Definition 6 developed a clever campaign for Coca-Cola. It created a truck designed to resemble a vending machine. There's a giant button on the back marked "Push". They drove it around Rio de Janeiro. When people pushed the button, all sorts of prizes popped out -- bottles of Coke, soccer balls, beach toys, and even a surfboard.
via Super Punch | Agency Website
http://tinypic.com/r/3133nns/7