At the station, the three accountants each buy a ticket while the three engineers just purchase one. “How are three people going to travel on only one ticket?” inquires an accountant. “Watch and you’ll see,” said an engineer. They all boarded the train. The accountants take their seats, but the three engineers cram into a restroom and close the door behind themselves.

Shortly after the train departs, the conductor comes around to collect tickets. He knocks on the restroom door and requests, “Tickets, please!” The door opens just slightly, and a single arm emerges with a ticket in hand. The conductor accepts it and continues on. The accountants recognize this and agree that it is a clever idea. So, after the conference, the accountants decide to emulate the engineers on the return trip to save money.

When they arrive at the station, they purchase one ticket for the return trip. To their surprise, the engineers do not purchase a ticket at all. “How are you going to travel without a ticket?” inquires one bewildered accountant. “Watch and you’ll see,” said an engineer. When they board the train all three accountants cram into a restroom and the three engineers cram into another one nearby. The train departs.

Soon after, one of the engineers exits his restroom and heads across to the one where the accountants are hiding. He knocks on the door and requests, “Tickets, please!”