Hötorget subway station in Stockholm is a great place to try out new digital fun ads, as their posters are mostly digital ones and the station itself isn't as crowded as the Central station. Here Coke decided to have some fun with posters that interact with people, if you stood in front of it and smiled, the interactive billboard would mimic your facial expression best it could. Thus making you laugh, and spreading happiness. Quite a cute idea that I'm sure entertained bored commuters as they waited for trains. Bonus, there's Coke available in the platforms vending machines too, so anyone could get a cold one if they got a hankering after playing with the billboard.

Ad agency: Isobar, Stockholm