Rocks are quite possibly the most common natural resource, and there are nearly as many thing you can do with a rock as there are things to do. Here, we have listed a very small fraction of the uses they can be put to:
Throwing them at stuff
Throwing stuff at them
Hitting stuff with them
Weighing down otherwise unsinkable objects
Collecting as a hobby
Winding a piece of string around them
Attaching to the end of a stick
Putting inside a sock
Creating crude tools by sharpening one rock through hitting it with another
Hitting together to make sparks
Dropping from high places
Feeding them to your little brother (disclaimer: If you actually try this, you're not very smart, and therefore it isn't my fault or problem)
Use as a sleep aid through blunt force
These are just a few basic uses that the common household rock can be put to. If you can think of any others, go try them.