一天。一个理发师挂出了一块招牌:“村里所有不自己理发的人都由我给他们理发,我也只给这些人理发。”于是有人问他:“您的头发由谁理呢?”理发师顿时哑口无言。因为如果他给自己理发,那么他就属于自己给自己理发的那一类。但是,招牌上说明他不给这类人理发,因此他不能自己理发。如果由另外一个人给他理发,他就是不给自己理发的人。而招牌上说明他要给所有不自己理发的人理发,因此他应该自己理。由此可见,不管做怎样的推论,理发师所说的话 one day. A hairdresser hung out a signboard: “All people in the village who do not have their own haircuts are given haircuts by me. I only give them haircuts.” Then someone asked him: “Who cares about your hair?” Suddenly speechless. Because if he gives himself a haircut, then he belongs to the kind of haircut that he has given himself. However, the signboard shows that he does not give such people a haircut, so he cannot cut his own hair. If another person gives him a haircut, he is someone who does not give himself a haircut. The signboard shows that he is going to give a haircut to all those who do not have his own haircut, so he should manage it himself. From this it can be seen that whatever the reasoning, what the barber said