"Piano Stairs," is about a staircase in a Stockholm subway that was retrofitted to look like piano keys and makes real sound. The video, which looks like it's part of a Volkswagen campaign, proves that if you make something fun you can change people's behavior. Nearly seven million people watched it on YouTube:

Miley Cyrus penned a playful rap and posted it to YouTube as a way of declaring that she's out...of Twitter.