However, in my opinion, Whitney is not a credible story teller. That is to say, we should not believe all that Whitney says. This is because Whitney does not understand the difference between a good joke and a bad joke; he has information but he takes everything at face value; he cannot separate truth from bias. We know this because Jim is a bad man and that his jokes are not fun but Whitney believes (his bias) that Jim is a good guy and therefore that his jokes are funny.