No prizes for guessing the inspiration behind this little idea. Advertising agency DDB and Volkswagen teamed up for a little experiment they called the Fun Theory, an ambitious attempt to try and change people's lazy behavior in the Swedish capital. The transformation of a subway staircase into a piano increased stair use by 66 per cent. (I pity the poor creative who had to sit in the metro station for two days on the trot and count the travellers.)
You can see another piece of cuteness from the agency, who are planning to roll out the idea for the English-speaking market soonish, after the jump. This time, it involves a very noisy rubbish bin.