The video below is a little stop-motion animation made by IBM. Why would IBM researchers want to make a movie? So they can demonstrate that they can move individual atoms around - that's correct, the little dots that make up the movie are individual atoms!
The researchers aren't just having a laugh, they're actually trying to discover the smallest number of atoms that can store a bit of data. They're aiming to make an atomic memory data storage system. Once you've watched the world's smallest movie watch the "making of the world's smallest movie" for information on how and why it was done.