Three doctors and three lawyers happen to be on the same train station, and discussing, realise that they are going to the same destination, on different conferences of course.

The doctors buy their tickets, and are astonished to find out that the lawyers have only bought ONE ticket.

- "How are you all going to travel with only one ticket", they ask
- "Wait and see", replied the lawyers

Soon enough, they all board the train, and they see the lawyers squeezing themselves in a toilet. After a little while, the doctors see a conductor knocking on the toilet door...

- "Tickets please"

A hand comes out, holding a ticket, the conductor takes it, punches a hole in it and returns it back to the hand. After 5 minutes, all three lawyers come out and sit on the seats.

The doctors decide that it is a neat trick, and so they are going to copy what the lawyers did.

Some days later, the respective conferences end and they meet again on the train station, where the doctors buy only one ticket, and later realise that the lawyers have bought NONE.

- "Hey what's going on?", they ask. "How are you going to manage travelling with no tickets at all?"
- "Wait and see", is the laconic answer.

Some minutes later, the train comes, they all board, and the doctors hide in a toilet while the lawyers do the same in a toilet nearby. The train leaves the station.

Five minutes later, a lawyer comes out of the toilet, goes to the doctors' toilet and knocks the door:

- "TICKETS PLEASE!"