This is the written equivalent of the phenomenon known as Stuff You Hear When You’re Not Paying Attention. Some people call it serendipitous browsing; some call it eavesdropping.
Stuff You Hear is, for example, the voice-change madlib created by switching stations. “I gotta –” “–switch to decaf!” (By the sound of it, yes. You do.) Or walking in on a conversation between two gamers and hearing “Yeah, I destroyed her last week. ” (Okay, I think I’m sitting over there. WAY over there.)
Stuff You Read… occurs when shelving or browsing, or any time a book opens at random. For instance:
“The check tells your bank to give $1000 to the guy who sold you the hippo.” (If You Made a Million)
“Pardon my meatball!” (On Top of Spaghetti)
“An ignorant skunk is a very sad skunk indeed.” (Our Library)
Incidentally, Stuff You Read is a rare phenomenon on e-readers, but by no means impossible.
So pick up a book in the middle, and see what you hear.