This has been going around the youtube circuit for quite a while now. Though this is pretty clever especially if you have a cat. If you don’t have a cat they pretty much act like this except more annoying, come to think of it your probably lucky.
This animation works so well because it is simple and based on real life experiences. From my understanding it is done in flash and is possibly frame by frame animation. Simon Toefield is simply a wonderful animator.
Here’s a link to his youtube channel:
and the company he works for: