On the day of their shipping departure, rock 1, the leader of all 20 rocks, gave his final speech to his fellow comrades. 

Dear fellow comrades!! Today shall be the day where we'll walk the path of our destiny! There will be a ship made for us, specially designed and to be able to fit all 20 of us!" 

The rocks were so happy and glad that they were finally able to leave the inhuman-world! Unfortunately, all 20 rocks didn't make it.