One of my favorite resources for [writing] stories is Dale Carnegie’s How to Win Friends and Influence People. Because it’s a book written for socially inept people who can’t figure out why no one likes them. If you reverse his advice, every situation that Dale Carnegie talks about is a roadmap for how to alienate people and making your social circumstance worse. All you need to do is do the opposite of everything Dale Carnegie says, and you will have a character who does things that people really do in the real world. You and your readers will feel like you can understand why they would do these things because we’ve all done them.
Cory Doctorow, quoted in Don’t Go Back To School