Most rocks don’t roll unless humans have a say in it.
As an advanced species we use rocks as entertainment, alcohol et al. We like rocks so much that we put a ring on them, a technological accomplishment that signifies commitment to a lifetime of unconditional love (alcohol et al).
Human babies in particular like to be rocked, as do man-made boats. Someone must have put two and two together and invented water beds, which is a nice way to close our 4.5-billion-years old evolutionary drive from sea to land.
Our next evolutionary goal would be to become rocks ourselves, not because of our desire to be stronger and more steady but to finally materialise our real estate dreams. We will continue to consume alcohol as long as it doesn’t have bubbles.