You Are Not So Smart: Why You Have Too Many Friends on Facebook, Why Your Memory Is Mostly Fiction, and 46 Other Ways You're Deluding Yourself

by David McRaney

You tend to see people as characters and look for consistency in their behavior. This is usually a good thing, as it helps you sort out whom you can trust. Wondering whether or not someone can be trusted and wondering whether or not someone is telling the truth are two different things.