The Black Swan by Nassim Nicholas Taleb
That aside, The Black Swan has numerous pieces of important information, from social psychological findings regarding happiness and relative rank to the plausibility of financiers having a good run for years but possibly just by luck, to philosophical explorations of the problems of induction, how we can know things and the inherent problems when we try to predict.
As it is so very easy to fall into myriad cognitive traps that bias the world for us, I find works like this valuable. Consequently, I think similar content should be mandatory in our education system (minus the snotty tone and occasional, overreaching statement).
In summation, worthwhile but you would probably do nearly as well with his first book as it was more concise and explored similar themes.