On a college field trip, four Engineering and four Pre-Law students were travelling on the same train. The law students each had a ticket, but the Engineers had but one ticket amongst them. One of the Engineers shouted “conductor’s coming!”, and the four Engineers crowded into one of the bathrooms. The conductor comes by and knocks on the bathroom door saying “Tickets, please”. The Engineers slip their one and only ticket under the door. The conductor punches it an moves on to the next car.
On the return trip, the four Lawyers, impressed by the Engineers’ trick, purchase only one ticket. The Engineers, however have no tickets at all!. Suddenly, one of the Engineers shouts “Conductor’s coming”. All four Engineers head for the bathroom, and all four lawyers crowd into the other one. Then, one of the Engineers slips out of his bathroom and knocks on the other bathroom door saying “Tickets, please”. The lawyers then slip their only ticket under the door, and the Engineer then picks up the ticket and joins his friends, waiting for the real conductor.