The story focuses on eight-year-old Billy and the various jobs he imagines he might hold once he grows up. While you can simply use the app as a glorified, touchable ebook, you can also let Yankovic read the story to you; the words he speaks are highlighted as he says them. When you're finished reading the story, the app's built-in games let you try out some of the vocations Billy considers; you can shave a tarantula, massage a gorilla, and race snails; the app promises that more games are coming soon.

As you read through the book, tilting and tapping your device elicits all sorts of hidden surprises: On one screen, tilting might make Billy's crayons slide around his desk; swiping on another screen sends his homework flying.

In a statement provided to by Team Yankovic, His Weirdness said: "I dreamed of one day helping to produce a cross-platform app that would be sold in the iTunes Store. I was a very prescient kid."

The app--which weighs in at a hefty 257MB--costs $3, works natively on the iPhone, iPod touch, and iPad, and requires iOS 3.2 or later.