Love the idea.
The Doubtful Guest by Edward Gorey. It's a whimsical picture book about a creature who shows up uninvited at a house and generally acts like my toddler. I first read it ~8 years ago when my wife-but-then-girlfriend introduced me to Gorey, and I've laughed every time I've read it since.
Here's a two minute reading of it.
RE: What is the best book you've ever read competition! 25 SBD prize money!