I remember the first time I heard a teenager say 'LOL.' Just what? But it means 'laugh.' Why don't you just laugh? What are you doing?

[about his dress robes...] I’m never wearing them," Ron was saying stubbornly. "Never." "Fine," snapped Mrs. Weasley. "Go naked. And, Harry, make sure you get a picture of him. Goodness knows I could do with a laugh.

Children's books aren't textbooks. Their primary purpose isn't supposed to be "Pick this up and it will teach you this." It's not how literature should be. You probably do learn something from every book you pick up, but it might be simply how to laugh.

You can laugh! But people used to believe there were no such things as the Blibbering Humdinger or the Crumple-Horned Snorkack!

And Percy was shaking his brother, and Ron was kneeling beside them, and Fred's eyes stared without seeing, the ghost of his last laugh still etched upon his face.