I have a theory about lying. I think that when someone lies a lot that it makes them crazy because the brain witnessed reality/truth and then finds itself telling a different story contradicting that. The brain is designed to reconcile conflicts which is one reason we sometimes see optical illusions or engage in cognitive dissonance. This tension between the two realities eventually possibly causes the mind to do strange things. Thus, too much lying will make you crazy!
The clintooons are good examples of your theory!