This man sticks his head

This man sticks his head into a barber shop and asks "How long before I can get a haircut?". The barber looks around the shop and says "About two hours". The man leaves.
A few days later the same man sticks his head in the door 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 man leaves.
A week later the same man sticks his head in the door and asks "How long before I can get a haircut?". The barber looks around the shop and says "About an hour and a half". The man leaves.
The barber looks over at a friend in his shop and says "Hey Fred, follow that man and see where he goes". In a little while Fred comes back into the shop smiling to himself. The barber asks "Fred, where did he go when he left here?". Fred looks up and says "To your house".