You think you know people, and then, you learn stuff about them that changes everything. Be careful about what you choose to believe. That character you might label a cad might be a hero. That hero you thought you knew might be a real jerk – or might be both. 
For example, I was rummaging around the internet and found a set of fun and amazing historical insights into the lives of former Presidents of the United States. FYI, I found most of these at BESTLIFE.COM and I can’t vouch for their veracity, but they do get your attention.