"Get out of the way" demanded Ginny impatiently. Harry rose quickly, and leaned against the corner of the nearby bookshelf as she began taking wild swings.
"Have you ever used a hammer before?" he asked in amusement.
"And why should that stop me?" replied Ginny immediately. Harry continued to gaze at her erratic attempts to nail down the floorboard, unsure how to respond. Any criticism would, he knew, be taken as a reason to double down on her current course of action. He stared at her tongue as it poked out the side of her mouth in an image of concentration, at her long, red hair as it was jerked around by the sharp movements of her head, at her right arm as it swung up and down, up and down, up and down… "Ow!" Ginny yelled, dropping the hammer in surprise and immediate bringing her left index finger up to her mouth.
Harry shook his head to clear it, and sat back down beside her. "Have you hurt yourself?"
"Yes." Ginny's voice was slightly petulant.
Harry paused for a moment, then smirked. "Well, I guess that's why."