Three Apple engineers and three Microsoft employees are traveling by train to a
conference. At the station, the three Microsoft employees each buy tickets and
watch as the three Apple engineers buy only a single ticket.

"How are three people going to travel on only one ticket?' asks a Microsoft
employee. "Watch and you'll see," answers the Apple engineer.

They all board the train. The Microsoft employees take their respective seats
but all three Apple engineers cram into a restroom and close the door behind
them.

Shortly after the train has departed, the conductor comes around collecting
tickets. He knocks on the restroom door and says, "tickets, 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 Microsoft employees saw this and agreed it was quite a clever idea.
So after the conference, the Microsoft employees decide to copy the Apple
engineers on the return trip and save some money (being clever with money, and
all that). When they get to the station, they buy a single ticket for the return
trip. To their astonishment, the Apple engineers don't buy a ticket at all.

"How are you going to travel without a ticket says one perplexed Microsoft
employee.
"Watch and you'll see," answers an Apple engineer.
When they board the train the three Microsoft employees cram into a restroom and
the three Apple engineers cram into another one nearby. The train departs.
Shortly afterward, one of the Apple engineers leaves his restroom and walks over
to the restroom where the Microsoft employees are hiding.

He knocks on the door and says, "Tickets, please..."