A guy stuck his head into a barber's shop and asked, "How long before I can get a haircut?" 

The barber looked around the shop full of customers and said,"About 2 hours." The guy left. 

A few days later the same guy stuck his head in the door and asked, "How long before I can get a haircut?" 

The barber looked around at the shop and said, "About 3 hours." The guy left. 

A week later the same guy stuck his head in the shop and asked,"How long before I can get a haircut?"

The barber looked around the shop and said, "About an hour only." The guy left.

The barber turned to a friend and said, "Ken, please do me a favor, follow that guy and see where he goes.
He keeps asking how long he has to wait for a haircut, but then he doesn’t ever come back".

A little while later, Ken returned to the shop, laughing hysterically.
The barber asked, "So where does that guy go whenever he leaves here?" Ken looked up, with tears in his eyes and said, "To your wife at home."