Double Life - http://www.youtube.com/watch?v=6Bqq38WZctA
Nothing explains better the potential of videogames.
EDIT: I have to add this one: http://www.youtube.com/watch?v=22HXIMASkZo
The idea of mixing a videogame shared universe with Toy Story for games is pure genious.
SONY's marketing department has made some really awesome commercials.