— ’What a tricky question!’ the young man noted. ’Alright, rabbi, give me another one.’
— ’As you say, young man. Two men are coming out of a chimney. One’s face is clean, the other’s is dirty. Which man will wash his face?’
— ’Wait, we already found out that the man with a clean face will wash his face.’
— ’That is not correct. Both men will wash their faces. The «clean man» will look at the man with a dirty face. He will assume that his face is also dirty. So, the man with a clean face will wash his face first. Then, the «dirty man» will notice that the man with a clean face washed his face, and will also wash his.’