Accoutants in train

A group of accountants and a group of engineers were traveling by train to a meeting. The engineers bought one ticket each and watched dumbfounded as the accountants bought only one ticket for their group. Upon inquiring of the accountants as to how they intended to travel with one ticket, they were told to "watch and learn." When the conductor began his collection of the tickets, the accountants all crowded into one bathroom. When the conductor knocked on the door and said "Ticket please", one of the accountants handed him their ticket. The engineers, being quick to learn, purchased only one ticket for the return trip but watched in utter amazement as the accountants didn't purchase any tickets. When the conductor began to collect tickets, the engineers crowded into one bathroom and the accountants into another to await his arrival. After the doors closed, one of the accountants walked over to the bathroom where the engineers were waiting, knocked on the door, and said, "Ticket please!"