This reference guide was gifted to me for my birthday by a lovely man, coworker, and friend (Thanks, Theo!) and I am here to shout its excellence from the rooftops.
What's Your Poo Telling You? is a pocket sized resource guide outlining (with detail, and often illustrations!) our various bowel movements and what they are telling us about our bodies. Written by Josh Richman and Anish Sheth, M.D., this cleverly phrased medical reference is as accurate as it is hilarious.
It is my professional opinion that any and all restrooms in your home are equipped with this little book.