Merlinโs beard, Harry, you made me jump,โ said Slughorn, stopping dead in his tracks and looking wary. โHow did you get out of the castle?โ โI think Filch mustโve forgotten to lock the doors,โ said Harry cheerfully, and was delighted to see Slughorn scowl.
J. K. RowlingAnd that boys," yelled Mr. Weasley over the tumult of the crowd below,"is why you should never go for looks alone!
J. K. Rowling