Life, The Universe And Everything by Douglas Adams

In Consequence Of A Number Of Stunning Catastrophes, Arthur Dent Is Surprised To Find Himself Living In A Hideously Miserable Cave On Prehistoric Earth. However, Just As He Thinks That Things Cannot Possibly Get Any Worse, They Suddenly Do. He Discovers That The Galaxy Is Not Only Mind-bogglingly Big And Bewildering, But Also That Most Of The Things That Happen In It Are Staggeringly Unfair.