This American Express commercial is one that I actually watch every time it comes on.  It features a bunch of sad faces on everyday objects, followed by a bunch of happy faces on everyday objects, supposedly made happy by using a credit card.  Ok, so the main idea of the commercial is stupid, but the artwork is pretty impressive.  I just can't help thinking of the person whose job it was to find all those faces.  What a cool job. 

More faces on this Flickr set (via Boing Boing), this gallery, and What The Face. 

The practice of finding faces in everyday objects is an example of the psychological phenomenon of pareidolia.  Other examples include seeing animals in clouds and finding Jesus on your Pop Tart.