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 2 hours.'
The guy leaves. A few days later, the same guy sticks his head in the door and asks, 'How long before I get a haircut?'
The barber looks around the shop full of customers and says, 'About 2 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 the shop an says, 'About an hour and half.'
The guy leaves.
The barber looks over at a friend in the shop, and says, 'Hey Bill, follow that guy and see where he goes.' In a little while, Bill comes back into the shop laughing hysterically.
The barber asks, 'Bill where did he go when he left here?'
Bill looked up and said, 'To your house.'

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There's someone in my head, but it's not not me - Pink Floyd