The hilarious crayons from the #1 New York Times bestselling The Day The Crayons Quit are ready to celebrate Halloween! The Crayons want to go trick-or-treating, but they're not sure what to say! In this humorous Halloween story, Purple Crayon teaches the rest of the box the magic words to say when they ring their neighbours' doorbells. (Hint: It's NOT 'Boo!')