While you can't judge a book by its cover, you can judge a book by the first sentence.
From Eoin Colfer's The Fowl Twins
From Lex Thomas' Quarantine: The Loners
From Ransom Riggs' Miss Peregrine's Peculiar Children: The Conference of the Birds
From James Gould-Bourn's Bear Necessity
From James Patterson's Maximum Ride: The Angel Experiment
From Katherine Applegate's The One and Only Ivan
From Rick Riordan's The Trials of Apollo: The Burning Maze
From Agatha Christie's Death on the Nile
Kristen Simmons’ Article 5: Breaking Point
From Jude Watson's Loot: How to Steal a Fortune
From Laura Ingalls Wilder's Little House in the Big Woods
From Adrian McKinty's The Chain
From Jesse Andrews' Me and Earl and the Dying Girl
From Rob Harrell's Wink
From Eoin Colfer's Artemis Fowl: The Last Guardian
First Sentence of a New World 