3 engineers and 3 accountants are traveling by train to a conference. At the station, the 3 accountants each buy tickets and watch as the 3 engineers buy only a single ticket. "How are three people going to travel on only one ticket?" thinks an accountant. The accountants take their respective seats but all 3 engineers cram into a restroom and close the door. Shortly after the train has departed, the TC 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 accountants saw this and agreed it was quite 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. The engineers dont buy a ticket at all. "How are you going to travel without a ticket?" says one perplexed accountant. "Watch and you'll see," answers an engineer. When they board the train the 3 accountants cram into a restroom and the 3 engineers cram into another one nearby. The train departs. Shortly afterward, one of the engineers leaves his restroom and walks over to the restroom where the accountants are hiding. He knocks on the door and says, "Ticket, please."