Three accountants and three engineers are traveling together by train to a conference.
At the station, each of the accountants buys a ticket, but only one of the engineers does.
Perplexed, the accountants ask, "How are you all going to ride on only one ticket?" The engineers respond, "Wait and see."
The train pulls in. The engineers immediately cram into a restroom together.
After the train leaves, the conductor comes by, knocks on the restroom door, and says "Ticket, please." The door opens a crack, and one arm reaches out with the ticket. The conductor takes it and goes on his way.
The accountants agree that this is a neat trick, and resolve to try it on the return trip.
At the beginning of the return trip, one of the accountants buys a ticket, but none of the engineers do.
Perplexed, the accountants ask, "How are you all going to ride without any ticket?" The engineers respond, "Wait and see."
The train pulls in. The accountants immediately cram into one restroom together, and the engineers cram into another one.
After the train leaves, one of the engineers emerges from their restroom, darts over to the accountants' restroom, knocks on the door, and says "Ticket, please."