Actually making a bouncy ball isn't all that difficult, if you can wrap your mind around how the animation bones can be relocated during anims, and with special weighting techniques. In the video here we show our Animesh prim baby using his Bouncy Ball Toy, somewhere in the "Let's Install Some Addables" section of the video (Around the 4:20 mark). This video shows one of our Cherub-type Youngin's.