A theory that states that the more stupid a person is, the more intelligent they are likely to think they are. This is caused by their incredibly narrow perspective of the world making them think that they know a hell of a lot. For someone to understand that they are stupid requires a certain kind of enlightenment - that they know relatively little - that is unavailable to stupid people.
Therefore, it is impossible for a truly stupid person to be able to admit that they are stupid.
Did you read that book he just wrote? It's too bad the Idiot Paradox won't allow him to realize that it'd be better suited as a toilet paper dispenser.