As soon as the train leaves the station, the three Apple engineers rush from their seats and all squeeze into one restroom. When the conductor comes through the car he knocks on the restroom door and says "ticket please!" The door opens a crack and the one ticket is handed to the conductor. The Microsoft engineers are impressed, and decide that's what they will do on the trip back.
Then on the return trip, the Microsoft engineers notice that the Apple engineers haven't bought any tickets. "How do you plan on getting home without any tickets?" they ask. "Watch and learn," one of the Apple engineers tells them.
As soon as the train leaves the station, the three Microsoft engineers hurry for the restroom. A few moments later, one of the Apple engineers gets up from his seat, knocks on the restroom door and says, "ticket please!"