Jon Can't Turn Visible

"Wow, she seems pissed," Karyn said. "Yeah," Jon said, grabbing the invisibility cape that he was wearing, intending on taking it off and becoming visible again. But it wouldn't come off. He pulled it as hard as he could, but it still wouldn't budge. "I think I have a problem." "What is it?" "I can't become visible again." In his haste to find a way to defend himself against his sister, he grabbed the Cloak of Invisibility without first reading the instructions. He ran back to his bedroom and looked at the sheet of paper that was lying where the cloak had been resting. The instructions were as follows: Simply put on the cape and you will become invisible. WARNING: Make sure you don't use any other magic or magical items while cloaked. Results are unpredictable. Now Jon wished that he had read the instructions.