Elmo loves jokes, and there are 9 of them in this charming interactive book! Ring the doorbell and hear doorbell sounds as Elmo visits his friends telling knock-knock jokes. Then press 5 additional buttons to hear Elmo laugh and say things like "That's so silly!" and "That made Elmo laugh!" Matching words with pictures and sounds enhances reading comprehension, and engages young readers at story time. Giggle along with Elmo!