A few years ago a watched this short animated film on you tube
It was about this unhappy guy thing, who lives in a black and white town and works in a happy glasses factory but no one is happy.
He goes home and opens up his stomach door and there is a bunch of lights and colors
He makes new happy glasses and puts some of his happy stomach light on them and when he puts on the glasses, his world looks like a colorful drawing, and everyone buys them and he becomes famous for changing the world, and then at the end he is at home smiling, but then he looks down into his stomach and it's empty and he gets sad again.

I need to see it again it's driving me crazy! :P

this video has been driving me crazy too for weeks... couldn't find it but at last ^^
--> http://www.youtube.com/watch?v=wd0ol25uUVU&feature=related