"You may begin." Professor Snape said, and he has barely finished his sentence when a loud BOOM sounded in the corner, and there was Mayumi, looking a little frazzled as she stared at what's left of her cauldron, her auburn hair blown back by the blast.
"...I barely touched it." She said faintly.
Next to him, Ron slammed his head against the counter and letter out the most exasperated groan Harry had ever heard from someone his age.