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Three engineers and three salespeople are going to a conference and must travel by train to get there. At the station, the three salespeople buy their three tickets and watch as the three engineers buy only a single ticket.

"How are three people going to travel on only one ticket?" says one salesperson.

"Just watch and you'll see," answers an engineer.

They all board the train and the salespeople take their seats and watch as all three engineers cram into a restroom and close the door behind them. The train departs and shortly afterward, 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 salespeople see all this and agree it is quite a clever idea. So after the conference, the salespeople 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. But to their astonishment, the engineers don't buy a ticket at all.

"How are you going to travel without a single ticket?" says one salesperson.

"Just watch and you'll see," answers an engineer.

They board the train. The three salespeople cram into a restroom compartment and the three engineers cram into another one nearby. The train departs. Shortly afterward, one of the engineers leaves his restroom, walks over to the salespeople's stall, knocks on the door and says, "Ticket, please".