The push
It all started when one boy got up and started to push the rock as a joke. It was a giant rock that was much too heavy for him, but he could feel that it was slightly loose. He knew that with enough force, this rock could be pushed off the ledge. He called the others to help him.
Seconds later, the entire group of friends were pushing on the rock and laughing while they were doing it. Hundreds of millions of years of forming and changing were all about to end in a matter of seconds. The rock came loose and rolled off the ledge, they laughed as they watched it smash at the bottom.