"I'm hungry," said Benny. A requisite line from each of them, as I recall. I read the first few as a child (was in elementary school in the 1960s) and read some of them to my daughter 30 years later. I remember an overnight flight right after she'd received a boxed set of 4 of them. I kept falling asleep, and she would elbow me in the ribs to wake up and read some more.