Rock is good. You can cook with rock, support and balance things, keep it as a pet, paint faces on it, wedge things that need wedging, use it as a paperweight, possibly shatter it into many knifey bits or sell it to your kid cousin as a magic rock. I think you can also do a few things with ropes and rocks, but I can't remember any of those things. Yes, you can throw rock, but rock likes most to bounce on water when thrown.
Arrr, rock good, rock cook, rock support. Rock have face. Rock wedge. Rock paperweight magic rock, sell. Rock shatter. Rock is pet. Use rope on rock. Throw rock fun. Rock bounce water.
Heating pad. Counterweight on bear bag. Massage tool. Circle template. Door stop. Wheel chuck. Pothole filler. Sculpture source. GI Joe mountain. The list goes on.
You can admire the rock. You can just hold the rock, meditate over its roundness. The rock can become your friend, your little secret, a comfort you can take anywhere. The rock is eternal. If you cradle it for a lifetime, you might contribute a miniscule amount to its perfect shape. Your life can have meaning.