Beth is having a bad day. She refuses to smile despite the fact that all of the adults in her life are doing silly things in an attempt to cheer her up (making odd noises, crawling, having her ride on their shoulder, etc). Her big sister breaks through at the end (it’s a children’s book, so of course we need our happy ending), and it’s a cute, clever book with bright pictures. I think the story is particularly engaging for the adult and the toddler because you can’t help but make silly noises and laugh a little at the adult’s various tactics. It’s probably even more repeatable if you have sister-and-sister siblings in your household, but it’s engaging and worth repeating regardless.