A guy stuck his head into a barbershop and asked, "How long before I can get a haircut"? The barber looked around the shop full of customers and said "About 2 hours". The guy left, but did not return that day. A few days later, the same guy stuck his head in the door and asked, "How long before I can get a haircut"? The barber looked around at the shop and said, 'About 3 hours.' The guy left and again, did not return that day. A week later, the same guy stuck his head in the shop and asked,...