…and here are two great examples.
Firstly the Ogori Café in Chiba, Japan, where instead of getting your order, you receive the order of the person in front of you instead. A really simple and fun idea that allows you to surprise and treat the next person in line. Love this, such a good idea and how much fun http://ow.ly/w3ff
Secondly, the Fun Theory from VW, which is a site dedicated to the concept that fun is the best way to change people’s behaviour. Simple genius. The piano stairs are awesome http://ow.ly/w3mA