The slang for the rectum is "prison wallet". - Mary Roach, Gulp: Adventures on the Alimentary Canal

"The simplest strategy for bouts of noxious flatus is to not care. Or perhaps to take advantage of a gastroenterologist I know: get a dog. (To blame.)"

"I challenge you to find a more innocuous sentence containing the words sperm, suction, swallow, and any homophone of seaman. And then call me up on the homophone and read it to me."

"It tastes like water spiked with strange."

"think of it.' said Robert Rosenbluth, a doctor whose acquaintance i made at the start of this book. 'no engineer could design something as multifunctional and fine tuned as an anus. to call someone an asshole is really bragging him up."

"The human digestive tract is like the Amtrak line from Seattle to Los Angeles: transit time is about thirty hours, and the scenery on the last leg is pretty monotonous."