What A Barber Found Out A Customer Is Doing To His wife

A man stuck his head into a barber's shop and asked, ''How long will i have to wait before i can get an haircut?''. The barber looked round the shop full of customers and said, ''Three hours''. The man left. A few days later the same man stuck his head in the door and asked, ''How long will i have to wait before i can get an haircut?''. The barber looked round the shop and said, ''Two hours''. The man left. A week later the same man stuck his head in the shop and asked, ''How long will i have to wait before i can get an haircut?''. The barber looked round the shop and said, ''One hour''. The man left. The barber turned to a friend and said, ''Please, do me a favour. Follow that man and see where he goes. He keeps asking how long he has to wait for an haircut, but he does not come back. A little while later, the friend returned, laughing. The barber asked, ''Where does the man go when he leaves here?''. The friend with tears in his eyes replied, ''He goes to your house, to sleep with your wife.''