Jon thought. There were so many possibilities....
Then there was a knock on the door. Jon's ten year old brother Mikey asked, "Jon, can I, um, come in?"
"Go ahead," said Jon.
Mikey opened the door and said "I just want to try out the new cloning machine you inherited from Grandpa." Of course Mikey was capable of being quite nice if he really wanted to get something. And everyone else thought it was normal for Jon to have a cloning machine.
"Hmm," said Jon. "Okay... but don't make a baby or a pet and expect me to take care of it."
There were still plenty of ways Mikey could cause trouble, and a lot of things Mikey could do wouldn't fit any fantasy of Jon's, but he could fix any trouble with the stone and make whatever he wanted later on. Mikey's use would still be a good test for the machine.
"I won't," said Mikey. Thanks, Jon! This is the best thing ever!"
"Machine?" said Mikey.
"Working..." replied a speaker on the front.
"Okay, I want you to make..."