If McSweeney's did books for 5-year-olds...
... they'd probably read something like this, but not as cheery, nor as colourful. (And that goes for the illustrations too.)
The purpose of the book is to help kids think about one of the questions they get asked most: what are you going to be when you grow up? The narrator leads the reader through a blizzard of characters and their occupations, some serious, some not so serious, and the things they do and use and eat and the way they link together. The writing is a wild, fluid ride, with lots of silly little points thrown in for fun (the McSweeney's comparison makes most sense if you look at the copyright page).
Rating: 8/10