"How to" by Randall Munroe, a guidebook on doing conventional things in unconventional ways.
The general feel for this book is best summarized in "how to cross a river":
The simplest way across a river is to ford it -- which effective just means pretend it's not there, continuing to walk, and hoping for the best.
For most of this book, the usual and often most effective way to do the task at hand would be pretty obvious, yet we pretend we don't such methods exist, and instead try to approach it as a new scientific experiment, and see what we would get. The end result is usually impractical, but fun to think about. Although note that not all ideas in this book are impractical, some of it such as predicting weather using colors of clouds are actually quite useful. And then there are advices from experts (notably Chris Hadfield) that are certainly useful even if the situations needing them are unlikely. This book is perfect for people who want to just read about procedures in guidebooks without the hassle of having to reproduce those steps.
Overall, the science parts are legit, and having a context of where to apply that scientific knowledge makes them all the more interesting. Adding the typical surreal XKCD humor on top and this becomes a very memorable book that is worth reading again.
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