Three Americans and three Canadians are traveling by train to a conference. At the station, the three Americans each buy tickets and watch as the three Canadians buy only a single ticket.

"How are three people going to travel on only one ticket?" asked one of the three Americans.

"Watch and you'll see," answers one of the Canadians.

They all board the train. The Americans take their respective seats but all three Canadians 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 Americans saw this and agreed it was quite a clever idea. So after the conference, the Americans decide to copy the Canadians 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 Canadians don't buy a ticket at all.

"How are you going to travel without a ticket," asks one perplexed American.

"Watch and you'll see," says one of the Canadians.

When they board the train, the three Americans cram into a restroom and the three Canadians cram into another one nearby. The train departs. Shortly afterward, one of the Canadians leaves his restroom and walks over to the restroom where the Americans are hiding. He knocks on the door and says, "Ticket, please."