So my first version of this little story was to have a small and energetic ball bouncing around wildly, until it manages to get on top of the much bigger box.

Unfortunately it’s scared to jump back down from such a height, and begins to bounce around nervously. The box is understandably irritated with this, and eventually just boots the ball off. 

After discussing it with some friends, I decided that it would be more effective not to animate the box, and simply have the ball bouncing around happily, minding its own business, it then comes across a tall box and decides to see if it can bounce all the way on top of it. A simpler animation would allow me to focus more on the believability of the ball animation. I was also weary of having too much going on at once. Showing the ball bouncing frantically, as well as the boxes reaction to this, would be too much for the viewers to take in at once.