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 and a half."
The guy left.
The barber turned to his friend and said: "Hey, Bob, do me a favor, follow him and see where he goes. He keeps asking how long he has to wait for a haircut, but he never comes back."
A little while later, Bob returned to the shop, laughing hysterically.
The barber asked: "So, where does he go when he leaves?"
Bob looked up, wiped the tears from his eyes and said: "Your house!"