A guy sticks his head in the barber shop and asks,
"How long before I can get a haircut?" The barber looks
around the shop and says, "About two hours."

The guy walks out.

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 the shop full of customers and says,
"About two hours."

Once again, the guy leaves the shop.

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 the shop and says, "About an hour
and a half."

Again, the guy walks out.

The barber is getting curious. He looks over at a friend
in the shop and says, "Hey Bill, follow that guy and see
where he goes."

A little while later, Bill comes back into the shop
laughing. The barber asks, "Bill, where did the guy go when
he left here?"

"To your house."