It started with a T-mobile commercial filmed in the Liverpool Street Station, that now has a Youtube viewership of over 10 million: http://www.youtube.com/watch?v=VQ3d3KigPQM

Now a dancing stunt to the Sound of Music's Do Re Mi has been performed in Antwerp's Central Station. http://www.youtube.com/watch?v=7EYAUazLI9k

Yes, I know these videos were set up and choreographed and designed to get attention. Still, I think these two videos are made of happy. I can't watch without getting goosebumps. It's a guaranteed mood lifter.