A lad stuck his head into a barbershop and asked, 'How long before I can have a haircut ?
The barber looked around the shop full of customers and said 'About 2 hours.' and the lad left.
A few days later, the same lad stuck his head in the door and asked, 'How long before I can have a haircut ?'
The barber looked around at the shop and said 'About 3 hours.' and the lad left.
A week later, the same lad stuck his head in the shop again and asked 'How long before I can have a haircut ?'
The barber looked around the shop and said 'About an hour and a half.' and the lad left again.
The barber turned to his friend and said 'Hey, Bob, he keeps asking how long he has to wait for a haircut, but he never comes back. Do me a favour and follow him and see where he goes.'
A little while later, Bob returned to the shop, laughing hysterically, and the barber asked 'Where does he go when he leaves here, then ?'
Bob looked up, wiped the tears from his eyes and said 'Your house'