The author of Predictably Irrational recently gave a fantastic talk at Google. His optical illusion metaphor is brilliant. It's amazing that we are willing to recognize that we "fall" for optical illusions (actually, it's impossible to not "fall" for them), but we assume that our brains are infallible. Yet our brains are what control our visual perception!
Towards the end of his talk he shows that most of us are petty criminals. And that in the aggregate, those of us who otherwise consider ourselves to be law-abiding cause more economic harm than every blue collar criminal combined. Fascinating stuff.