“Writin’ lines! What good’s that to anyone? Yeh’ll do summat useful or yeh’ll get out. If yeh think yer father’d rather you were expelled, then get back off ter the castle an’ pack. Go on!” – Hagrid laying down some truths about life at Hogwarts to Malfoy (Harry Potter and the Philosopher’s Stone).
Several books later….
“Now, you are going to be doing some lines for me, Mr Potter. No, not with your quill,” she added, as Harry bent down to open his bag. “You’re going to be using a rather special one of mine. Here you are”. – Umbridge trying to punish Harry in her own special way (Harry Potter and the Order of the Phoenix).