This was the final version of my cereal shuffling machine animation, where tons of cereal gets dropped into the scene, and then slowly churned away.
I had to add some special, hidden physics blocks to keep all the cereal contained as it was disposed of, but you can't really tell from the limited view. I also adjusted the background to be a little warmer for this one. I was getting tired of the colder blue/purple fade.
It took a long time to render this one - 2,290 frames, each taking 6-10 seconds to finish.