A guy sticks his head into a barber shop and asks, "How long before I can get a haircut?" The barber looks around the shop full of customers and says, "About two hours." The guy leaves.
A few days later the same guy sticks his head in the door and asks, "How long before I can get a haircut?" The barber looks around and says, "About three hours." The guy leaves.
A week later the same guy sticks his head in the shop and asks, "How long before I can get a haircut?" The barber looks around and says, "About an hour and half." The guy leaves.
The barber turns to a friend and says, "Hey, Bill, 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 Bill returns to the shop, laughing hysterically. The barber asks, "So where does that guy go when he leaves?" Bill replies, "Your house".