( CNN ) -- Making a set of subway stairs into a piano and a bottle bank into an arcade game ; just two ingenious ways to get people to take time to do the right thing and have fun . The viral videos are made by a Swedish advertising agency DDB for Volkswagen as part of The Fun Theory campaign . The company wanted to show that by making things fun , you 're more likely make people change their behavior for the better , be it for the environment , for themselves or other people . Does it matter that such a fun little project is connected to a car company ? You decide . In the meantime , enjoy the videos .
Swedish advertising : A viral video called ' The Stockholm Theory ' Shot on streets of Stockholm , turned public transportation into a piano keyboard . Another video turned a bottle bank into an arcade game .