"I wish Karyn was here," Jon said. He wanted to make sure she was around when he made his wishes, otherwise her memories would change to fit the new reality. But after he made his wish, he was puzzled, as the stone wasn't glowing and Karyn wasn't appearing in his room.
What's wrong with this thing? he thought, looking at the stone.
"I wish I knew why my last wish wouldn't come true," he said, but still nothing happened.
Was this stone a fake? It looked the same to Jon as it did yesterday. But what if it was just a fake replacement? Whoever had done this must have thought Jon was too stupid to catch on.
Growing angry at these turn of events, Jon made another wish while holding the stone. But he thought it was just a regular stone, so he didn't care.
However, his wish (and the two before it) would be granted, just as soon as the sun went down, in about eleven hours, since this was The Night Stone.
Seething mad, Jon said "I wish ..."