Can you get more people to take the stairs by making it fun to do? That’s the question asked in Piano Stairs, a new viral video that has reached well over 2.5 million views on YouTube in just under two weeks.

Piano Stairs is part of a Volkswagen viral video marketing campaign called “The Fun Theory.” Their theory? “Fun can change behavior for the better.” They set-forth to prove their theory by turning plain, old stairs into a fully functioning keyboard and filming the public’s reaction to it. Not only is the video an interesting approach to creating social change, but it’s fun to watch, as well.

With an abundance of internet video-sharing sites, such as YouTube and Vimeo, it’s becoming easier to share our own thought-provoking videos with the world. All it takes is one question, a camcorder and a little bit of work, and you, too, could have the next viral video.

Are you thinking about using the general public in your next video? Be sure you’re Keeping it Legal with Location and Artist Release Forms.