While you can't judge a book by its cover, you can judge a book by the first sentence.
From Paul Stewart and Chris Riddell's The Edge Chronicles: Clash of the Sky Galleons
From Emma Steinkellner's The Okay Witch and the Hungry Shadow
From Jen Wang's Stargazing
From Tori Sharp's Just Pretend
From Chad Sell's Doodleville
From Paul Stewart and Chris Riddell's The Edge Chronicles: The Winter Knights
From Rick Riordan's Camp Jupiter Classified
From Jennifer L. Holm's The Fourteenth Goldfish
From Jeffrey Brown's Lucy & Andy Neanderthal: The Stone Cold Age
From Martine Leavitt's Calvin
From Shandy Lawson's The Loop
From Emma Steinkellner's The Okay Witch
From Paul Stewart and Chris Riddell's The Edge Chronicles: Freeglader
From Rick Riordan's Demigods & Magicians
From Bassem Youssef and Catherine R. Daly's The Magical Reality of Nadia
First Sentence of a New World 