"Who are you?" Jon asked his doppelganger.
"I'm Jon. Who are you?"
"I'm Jon."
"You can't be, because I'm Jon."
"No. I am. See, I've got this," Jon said, holding up the stone.
His doppelganger tried to grab it. "Hey, that's mine!"
"I don't know who you are, but you're not me. And this stone isn't yours."
The bedroom door opened and Karyn walked in. "Hey! What are you two doing in my room?"
"Wait a minute," Jon said. "You're not confused that there are two of me?"
"Why would I?" Karyn asked.
Karyn didn't hear Jon's wish, so when the stone created Jon's doppelganger, reality (including Karyn's memories) changed so that it was normal. But what could possibly be the reason that there were two Jons?