From The Hitchhiker’s Guide to the Galaxy by Douglas Adams (1979).

The first in a 5-book trilogy, the original HHGTTG is one of sci-fi writing’s foundational novels. Originally based a BBC Radio Play, Adams developed it into a novel, then a series, and then a movie (seen above) in 2005.

If you ever want to understand the answer to life, the universe and everything, start with this book.