Three Engineers and three Accountants are going on a business trip by train.

At the train station, the 3 accountants are ordering 3 tickets while the engineers are only ordering one ticket. The accountants ask "Why only one ticket?", the engineers reply that they have a scheme to save money.

So they all board the train and upon departure, the 3 engineers get into one bathroom. When the Train Controller checks for tickets, he takes the three tickets from the seated accountants and then knocks on the bathroom door asking "Ticket please" - the door opens slightly with a hand giving him one ticket. A couple of minutes later, the engineers come out of the bathroom and sit in empty seats making fun of the accountants.

On the way back, not wanting to be outsmarted, the accountants buy one ticket only but they notice that the engineers do not buy any, so they ask "You think you can ride free now?" - the engineers reply that they now have an even better scheme to save money.

So they all board the train and upon departure, the 3 accountants get into one bathroom and they see the 3 engineers all getting into the other one. Shortly after departure, one of the engineer gets out of its bathroom and knocks on the accountants bathroom door saying "Ticket please",