This story is about three accountants who doubted their three engineer friends. They were traveling by train to a conference. The accountants bought three tickets, but the engineers only bought one. "How are three people going to travel on only one ticket?" an accountant asked.

"Watch and you'll see," said an engineer.

They all boarded the train. The accountants took their seats, but the three engineers crammed into a restroom and closed the door behind them. The train departed the station and soon the conductor came through the car asking for tickets. He knocked on the restroom door and said, "Ticket, please." The door opened a crack and a single arm emerges with a ticket in hand. The conductor took it and moved on.

The accountants agree that this is a rather clever idea so after the conference, they decide to duplicate the engineers' feat. They buy only one ticket, but are astonished when the engineers buy no ticket at all! "How are you going to travel without a ticket?" the accountants ask. Watch and you'll see, reply the engineers.

When they boarded the train, the accountants crammed into a restroom with their ticket while the three engineers did the same in a nearby restroom. After the train departed the station, one of the engineers left the restroom and walked over to the restroom where the accountants were hiding. He knocked on the door and said, "Ticket, please."