We thought this would be a cute book for our soon-to-be five year old grandson. We were in for a treat. This was his first introduction to knock-knocks, and he began laughing harder and harder at each as he discovered the joke. "She was supposed to say 'I need a" but she said "Anita" (Bath, that is!) He giggled and roared, becoming almost breathless with laughter at each new knock-knock. Ten aren't a lot, but they certainly tired him out. What a delight to see! I'd like to see the author write some follow-up books. We've looked at other knock-knock books in the stores, but most of them have many jokes that presume a vocabulary or a cultural literacy beyond that of a five year old. This collection hit exactly the right keys.