Slowly Swapping: Tiffany is Write

It looked like his locker. Textbooks, notebooks, schedule taped to the side. But, it didn't look unlike other lockers int he school. He didn't have anything in there uniquely his, did he? He pulled out a notebook and opened it. "Hey!!" Tiffany objected. It was definitely his notebook. He recognized his handwriting. "This is mine..." "No, it isn't!" Tiffany said. "It's mine," she insisted, flipping to the front. The name in the front of the notebook was Tiffany Sanders. "It's my handwriting." "Really?" Tiffany challenged him. "I'm not sure what you're doing, Jon...but...you are acting really weird." He found a blank page. "Write something..." "What? Why?" "Please," he said. She wrote down a sentence, confused. He frowned. That was his handwriting. He took the pen and tried himself.