Three engineers and three accountants are traveling by train to a conference. At the station, the three accountants each buy tickets and watch as the three engineers buy only a single ticket. "How are three people going to travel on only one ticket?" asks an accountant. "Watch and you'll see," answers an engineer. All of them board the train.
The accountants take their respective seats, but all three 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, "Tickets, please." The door opens just a crack, and a single arm emerges with tickets in hand. The conductor takes them and moves on.
The accountants saw this and agreed it was a clever idea. So after the conference, the accountants decide to copy the engineers on the return trip and save some money. When they get to the station, they buy a single ticket for the return trip. To their astonishment, the engineers don't buy any tickets at all. "How are you going to travel without tickets?" says one perplexed accountant. "Shh! The other characters mustn't know!" whispers an engineer.
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