Coincidence?

How strange is this? Over the weekend I received an email from my first disgruntled employee (didn't like his seating assignment). I responded by email this morning, since I'm not in town. I shut down the computer and went out to my rental car. When I opened the back door to put my bag in the back seat, I saw a book there that I hadn't noticed yesterday: "You Want Me to Work with Them? How to get along with others at work." or something to that effect. Who has been planting appropriate books in my car??