Harry and Cho
Well.

Realising the book was divided into half suddenly, the Ravenclaw girl turned over to see what had happened. She stared at Harry who was looking somewhere else, pretending nothing has happened at all.

"So what do you want to do with me?"she asked, looking quite angry with this lion boy.
"I...I...,"he said,facing down on the table. He was too afraid to look into the girl's eyes.
"Fine,"she replied as she was taking her wand out from her pocket slowly. She whispered one of the softest word ever,"langlock". "I don't want to hear from you either. You don't have to say anything. I will count this as myself being unfortunate,"she shouted at him and gave him a piece of paper and went away.

Harry wasn't able to say anything or response to her or even apologising for his mistake. He took a look of the piece of paper and went out of the classroom silently. Maybe he was wrong.