This is a classic little book that summarizes basic rules of probabilities and statistics and how they are often misused to produce official sounding statistics.
I love the humorous and accessible writing in this book. It's a greatest hits of statistical sleights of hand and snake oil medicine.
You may already know concepts like median, mean and mode, but I'll wager that your statistics professor didn't spend too much time on how they are misused in the real world.
And folks, these tricks, get used over and over again, year-in and year-out. After reading this book, I can spot this stuff in the news everyday.
One of my favorite bits: the section on typical graph tricks (you'll have to check it out!)