Broken glass littered the floor, light danced on them casting reflections onto the wall. Hermione contemplated the mess wondering if it would do any harm if she just left it there. It wasn't really hurting anyone and it wasn't really her mess to clean up.
Sighing, she pulled out her wand.
"No, don't!"
Hermione looked at him skeptically.
"Watch!" he said, motioning to the glass.
The broken glass rose up and mended itself. Hermione smiled.
"Have I told you that you are the most brilliant man I know?"
"Not today."
Fred scooped her up and carried her back to their room to celebrate another new product.