In the lord's year of 1986, a man named Stanley Herz wrote "Conquering the Corporate Career: A Guide for Professional Success in the Office." I was 14—and my life would be forever changed.
$250 on Amazon! :).
Jay Johnstone's "Temporary Insanity" was that book for me. I had gotten a copy at age 12, and it was the first book I had ever read that revealed other baseball players' proclivities for pranks/partying/cussing, etc., with absolutely no censorship whatsoever. It was through that book that I learned about the tradition of rookies painting a certain anatomical part of a horse statue located near Wrigley Field. Also, how they used to lock Tommy Lasorda in his spring training barracks room by tying his doorknob (the door opened inward) to a nearby tree.
Naturally, I thought it was the greatest book ever written. I still recommend it today - it's not a large volume and it's a pretty easy read.
("Ball Four" came out eight years before I was born; it wasn't until I was in my 20s that I found a copy in a bookstore. It became an instant favorite as well.)