Yes, I watch children's shows. I'm a babysitter. Get over it.
By the book. It's an odd phrase. It means following instructions, or doing things the way they were mean to be done. It's not a very common phrase. So when I heard it the other day, it caught my attention.
I was watching some children and a nearby television was on, tuned to a children's show channel. A show called “Wow Wow Wubzy” was on and at the end of the episode a “moral of the story” song started. It was called, “By the Book”.

