Megosztott hang

A skinny, nerdy school boy wearing glasses is walking through a school hallway while drinking water and holding a book. He looks awkward and introverted. As he approaches a group of stylish school girls, they start laughing at him and making fun of his appearance. The boy stays calm and quiet. He takes off his backpack and hands it to one of the girls. The backpack is extremely heavy (around 25 kg), and as soon as she grabs it, it drops to the ground. She tries to pick it up but struggles becaus