Three engineers and three accountants were traveling by
train to a conference. At the station, the three accountants
each bought tickets and watched as the three engineers
bought only one ticket.
"How are three people going to travel on only one ticket?"
asked an accountant.
"Watch and you'll see," answered an engineer.
They all boarded the train. The accountants took their
respective seats, but the three engineers all crammed into
a rest room and closed the door behind them. Shortly after
the train departed, the conductor came around collecting tickets.
He knocked on the restroom door and said, "Ticket, please".
The door opened just a crack and a single arm
emerged with a ticket in hand.
The conductor took it and moved on.
The accountants saw this and agreed it was a quite clever
idea. So, after the conference, the accountants decide to
copy the engineers on the return trip and save some money
(being clever with money, and all that). When they got to the
station, they bought a single ticket for the return trip. To their
astonishment, the engineers didn't buy a ticket at all.
"How are you going to ride without a ticket"? said one
"Watch and you'll see", answered an engineer.
When they boarded the train, the three accountants crammed
into a restroom and the three engineers crammed into another
one nearby. The train departed. Shortly afterward, one of the
engineers left his restroom and walked over to the restroom
where the accountants were hiding. He knocked on the door
and said, "Ticket, please."