Read that last month. There were laugh-out-loud moments. (Not surprising when the author is a comedian.)
That’s the way I do it – the main text, not the prologue or foreword.
“There was never nothing.”
The Sugar Frosted Nutsack, by Mark Leyner
Great title, disappointing cover art. 
“Being puzzled by great works of literature is, I’ve always believed, a healthy response.”
Frankenstein’s Brain: Puzzles and Conundrums in Mary Shelley’s Monstrous Masterpiece, by John Sutherland
“How the hell did you not see anything until now?”
The Valley of Shadows, by John Ringo and Mike Massa
“Dr. Bharadwaj told me once that she thought I hated planets because of the whole thing with being considered expendable and the possibility of being abandoned.”
System Collapse, by Martha Wells
“When are we going to LEAVE this FUCKING house!" screamed Dina Bua, startling everyone around her.
River of Night, by John Ringo and Mike Massa
OP chiming in (if that matters)…
As for me, I read each of the “first” sentences and post the more interesting one.
That said, each contributor may feel free to follow their own rule on this, as long as just one sentence is posted.
mmm
“Mom had a way of obfuscating when anyone asked how she and our father first met.”
The Latecomer by Jean Hanff Korelitz.
“Three presidents dominate American history: George Washington, who founded the country; Abraham Lincoln, who preserved it; and Franklin Delano Roosevelt, who rescued it from economic collapse and then led it to victory in the greatest war of all time.”
FDR, by Jean Edward Smith
“Abba Poemen said about Abba Pior that every single day he made a fresh beginning.”
Desert Wisdom: Sayings from the Desert Fathers, translated by Yushi Nomura.
Filipe Sousa and Pedro Alves squelched through the muddy streets of Boma.
The Wages of Sin, by Harry Turtledove
“I am going to begin a diary again, because I have quite a little time on my hands, with nothing to do for quite a time.”
But Gentlemen Marry Brunettes, by Anita Loos
“James Christopher Harrison peered out the paned living-room window of his family home in the railway town of Junee in New South Wales, Australia.”
Good Blood: A Doctor, a Donor, and the Incredible Breakthrough that Saved Millions of Babies, by Julian Guthrie
Now I read that as “peed out the window”.
“The King stood in a pool of blue light, unmoored.”
Station Eleven, Emily St. John Mandel
Fourth one in this thread.
“Venice is a fish.”
Venice Is a Fish, by Tiziano Scarpa
“Then said Littleheart son of Bronweg: ‘Know then that Tuor was a man who dwelt in very ancient days in that land of the North called Dor-Lómin or the Land of Shadows, and of the Eldar the Noldoli know it best.”
The Fall of Gondolin by J.R.R. Tolkien, edited by Christopher Tolkien
“Take 'em an inch and they’ll give you a hell.”
The Shockwave Rider by John Brunner
As Frank Wisner watched from a dark corner of the nightclub, the diverted stage spotlight swept over the crowd until it found the man who had just stepped through the entranceway.
The Quiet Americans: Four CIA Spies at the Dawn of the Cold War by Scott Anderson