Ten MA's and ten PhDs went to a meeting by train. The MAs each had their own ticket, but the PhDs -- who have little money, of course -- had only one ticket between them. The MAs asked the PhDs, "How are you going to manage with only one ticket?" "Just watch." replied the PhDs.
They all got on the train and the ten MAs took their seats and handed their tickets to the conductor. Meanwhile, the PhDs all piled into a bathroom. When the conductor came by, a single arm reached out and gave him the ticket.
The MAs, feeling enlightened, decided to try the same thing on the way home, so they purchased just one ticket between the ten of them. The PhDs bought no ticket at all. "How are you going to get home?" asked the MAs. "Just watch." replied the PhDs.
When they get on the train, all the MAs piled into a bathroom and nine of PhDs got into another bathroom. The tenth PhD then knocked on the MAs' bathroom door and said "Ticket please." Out came a single arm to hand over the ticket.
The moral of the story? Don't use a technique unless you thoroughly understand the principle... =)
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