Bouncing ball

Long story short:
I've created two balls:
1. Simulating bowling ball
2. Simulating ping pong ball

This is strange. I've done many character and animations in my life but I still had small problems to create realistic bounces. Well, that's why we do those silly tasks.

Here's how graph editor (doing it without graph editor is like drawing with a brick) looks like for bowling ball:

and now, much different graph for ping pong ball: