The Watson Selection Task is an example of how lousy you are at logic, but you are also filled with beliefs that look good on paper but fall apart in practice. When those beliefs fall apart, you tend not to notice. You have a deep desire to be right all of the time and a deeper desire to see yourself in a positive light both morally and behaviourally. You can stretch your mind pretty far to achieve these goals.
David McRaney – You Are Not So Smart