Marvel no more. The mental disease that causes this is called sociopathism.
Ever wonder what Bill&Hill see when they look in the mirror? They see this. A brief excerpt on the topic at hand:Pathological Lying
Bingo!
Has no problem lying coolly and easily and it is almost impossible for them to be truthful on a consistent basis. Can create, and get caught up in, a complex belief about their own powers and abilities. Extremely convincing and able to pass lie detector tests.
I like Lyndon Johnson's claim that his grandfather fought
at the Alamo. False, of course.