Mikey's mother didn't hear most of the wish, and that counted as not hearing it. So she thought she had always been in Mikey's body. In fact, she thought she was Mikey.
"Mikey" blinked. He had just accidentally swapped himself with his mother! But for some reason, the swap just didn't work. He couldn't understand it.
He looked over to where his mother was, and he saw that she had fainted. He didn't understand it either. Why had this happened?
At least he still had the stone. Was there some other wish he could make?