Animation Basics 2: Ball With Attitude and Tail

This Monday, class started out with each student pulling a piece of paper out of a bag. On the paper was written an emotion; "sad", "happy", "angry"; I pulled "angry". Now, the assignment was to use the following 3 days on creating an animation of a ball with a tail, expressing the aforementioned emotion. But the assignment had very specific requirements: the clip had to be exactly 7 seconds (175 frames) long, where exactly the first 5 seconds were to be made up of movement and the last 2 seconds should show a held position (in my case, a pitch black screen - just to fool everybody).