Three IBM Engineers and three Microsoft Employees are traveling by train to 
    a conference. At the station, the three Microsoft Employees each buy 
    tickets and watch as the three IBM Engineers buy only a single ticket.  
    "How are three people going to travel on only one ticket?" asks a Microsoft 
    Employee. "Watch and you'll see," answers the IBM Engineer.
    They all board the train. The Microsoft Employees take their respective 
    seats but all three IBM Engineers cram into a restroom and close the door 
    behind them.  Shortly after the train has departed, the conductor comes 
    around collecting tickets. He knocks on the restroom door and says, "Ticket, 
    please." The door opens just a crack and a single arm emerges with a ticket 
    in hand.  The conductor takes it and moves on.
    The Microsoft Employees saw this and agreed it was quite a clever idea.
    So after the conference, the Microsoft Employees decide to copy the IBM 
    Engineers on the return trip and save some money (being clever with money, 
    and all that). When they get to the station, they buy a single ticket for 
    the return trip. To their astonishment, the IBM Engineers don't buy a ticket 
    at all.  "How are you going to travel without a ticket?" says one perplexed 
    Microsoft Employee. "Watch and you'll see," answers a IBM Engineer.
    When they board the train the three Microsoft Employees cram into a restroom 
    and the three IBM Engineers cram into another one nearby. The train departs. 
    Shortly afterward, one of the IBM Engineers leaves his restroom and walks 
    over to the restroom where the Microsoft Employees are hiding.  He knocks on 
    the door and says, "Ticket, please."