3 Scousers and 3 Americans

Three Americans and three scousers are travelling by train. At the station, the three Americans each buy tickets and watch as the three scousers buy only a single ticket. "How are three people going to travel on only one ticket?" asked an American. "Watch" answers a scouser.

They all board the train. The Americans take their respective seats but all three scousers cram into the toilet and close the door behind them.
Shortly after the train departs, 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, on the return trip, the Americans decide to copy the scousers 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 scousers don't buy a ticket at all. "How are you going to travel without a ticket," asks one perplexed American. "Watch" says a scouser.
When they board the train the three Americans cram into a toilet and the three scousers cram into another one nearby. The train departs. Shortly afterward, one of the scousers leaves his toilet and walks over to the toilet where the Americans are hiding. He knocks on the door and says, "Ticket, please".