" The Remembrall tells you that you’ve forgotten something, but not what you’ve forgotten. Which kind of defeats the purpose. "

― Brian Boone , The Unofficial Harry Potter Joke Book 4-Book Box Set: Includes Great Guffaws for Gryffindor, Stupefying Shenanigans for Slytherin, Howling Hilarity for ... Jokes and Riddikulus Riddles for Ravenclaw!