Who's the brightest?

[RobMc]

Three Scots and three American tourists are traveling by train to a football match.
At the station, the three Americans each buy tickets and watch as the three Scots buy only a single ticket.
"How are three people going to travel on only one ticket?" asked one of the three tourists.
"Watch and you'll see," answers one of the Scotsmen.
They all board the train. The Americans take their respective seats but all three Scotsmen cram into a toilet and close the door behind them. Shortly after the train has departed, the conductor comes around collecting tickets. He knocks on the toilet 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 Scots 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 Scots don't buy a ticket at all.
"How are you going to travel without a ticket," asks one perplexed tourists. "Watch and you'll see," says one of the Scotsmen. When they board the train the three Americans cram into a toilet and the three Scots cram into another one nearby. The train departs. Shortly afterward, one of the Scots leaves his restroom and walks over to the restroom where the Americans are hiding. He knocks on the door and says, "Ticket, please."