What's a good book on psychology for amateur reading?

I'm looking for one which focuses less on abstract theories and defining esoteric terms and more on what really happens around us, like why do people behave the way they do and stuff like that. I don't want to learn how to cure people with "problems" like a professional but just to understand their problem. Please recommend only what you've read yourself; no word of mouth stuff because I've got time enough only to read one book.