A man has a barber who is also a man, and the barber shaves other men, but not women. Is the barber a man or a woman?
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A man has a large supply of black and white tiles. He adds a single tile at a time, and each time he does, he asks himself, "Is this the last tile I will ever add?" If he never adds a tile, then the answer is yes. If he always adds more tiles, then the answer is no. But what if he adds a single tile, and then never adds another tile? Or what if he adds 1,000 tiles, and then never adds another? The puzzle is: is there a point at which he will know the answer to his question?
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A man says, "I am lying." Is he telling the truth or is he lying?
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The hero Theseus replaced every plank of a ship, one by one, and each time he replaced one, the question arose, "Is this the ship that will eventually be destroyed by the Minotaur?" If he never replaced a plank, then the answer would be yes; if he always replaced planks, the answer would be no. But what if he replaced one plank, and never replaced another? Or what if he replaced all the planks, except for the one that will be destroyed by the Minotaur? The puzzle is: is there a point at which he will know the answer to his question?
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