Look at this rock! Isn’t it beautiful? A pet rock can be a substitute as a pet for poor people. A pet rock is like a dog; it will protect you. How to use a pet rock for self defense: 1. Put the rock in your hand. 2. Throw the rock at robber. 3. Try to tell the police that he fell. 4. Easy Money. As a bonus, it can also be used to discipline children. How to discipline children 101: 1. Put the rock in your hand. 2. Throw the rock at child. 3. Tell the police he fell. 4. Bury him. 5. Get another child. 6. Rinse and repeat if the child misbehaves. 7. Profit. You see how useful a pet rock is?