““Once two clever Athenian policemen were pursuing a Theban thief towards the city boundaries when they came upon a sign: ‘The Sign of the Grape. Thebans made welcome.’ One said: ‘He will have taken refuge here.’ ‘No,’ cried the other, ‘this is just the place where he will expect us to look for him.’ ‘Exactly,’ rejoined the first, ‘so he will have decided to outwit us by entering.’ They therefore searched the place thoroughly. Meanwhile the Theban thief, who could not read, had run on to safety across the boundary.””
