This one is a clever one, from DoubleYou for Microsoft in Spain. To talk about the new developments and capabilities of Hotmail service, and based on the claim "we've changed so you'd like us more", a 30-day real-time campaign was created, with a boy trying to change (asking users for help and collaboration) so he could get her girlfriend back in love with him again:

The product is then shown, as a medium for the boy to achieve something and not as the main thing of the campaign, i love this. There was some discussion about if the story was true or faked, and although i think it's true, does it really matter? the content and the organic nature of the whole thing makes it entertaining enough as to be one of the cutest thing i've seen coming from Spain lately.