This animation has always been one of my favourites because it was one of my animation class assignments. The key to this lesson was to use only the Track View (now known as the "Curve Editor") nodes to create an animation of three balls bouncing down some stairs; a Balloon, a Basketball, and a Bowling ball. The idea was to accurately portray their differing weights and how they would interact with stairs in normal gravity.
3D Animation Lesson
3D Studio MAX