My son (20 months) is at an age where he is very curious and into learning new things. He has been going up to doors and knocking on them, saying, "Knock, Knock. Who's there?" So, when his grandpa found this book he knew it would be perfect for our son. My son has read this book about 100 times in the past week. He just loves it! The knock, knock jokes are so clever and the illustrations are great. This is a really fun book. I recommend it and adults won't get tired of reading it OVER and OVER again.
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