The barber

A young student went one day to his barber. He entered into conversation and asked him if he had many competitors in her pretty city. Seemingly innocent way, the barber replied, "I have no competition because of all the men of the city, I obviously do not shave those who shave themselves, but I am fortunate to shave. all those who do not shave themselves. "


What, then, such a statement so simple can it default to the logic of our young student so smart?
The answer is in fact innocent, until one decides to apply to the case of the barber.
If he shaves himself, or not ? 

Suppose he shaves himself, he falls into the category of those who shave themselves, which the barber said he did not shave the course. So he does not shave himself.
Very good ! Suppose when he does not shave himself, he enters in the category of those who do not shave themselves, which the barber said he shaved them all. So he shaves himself.
Fianalement this unlucky barber is in a strange position: if he shaves himself, he does not shave himself, and if he does not shave himself, he shaves. 
 This logic is self-destructive, contradictory stupidly, rationally irrational.

Personally I would answer that the barber has a
very long beard and therefore does not need to be shaved
but then
he does not shave himself, and is destroyed by ...

someone blew me it's a woman or
He lives outside the boundaries of the city and
is not concerned with his statement. tional.