Engineering vs Math Majors

A math and engineering convention was being held. On the train to the convention, there were both math majors and engineering majors. Each of the math majors had his/her own train ticket. But the Engineers had only ONE ticket for all of them. The math majors started laughing and snickering. The engineers ignored the laughter.

Then, one of the engineers said, "Here comes the conductor". All of the engineers piled into the bathroom. The math majors were puzzled. The conductor came aboard and collected tickets from all the math majors. He went to the bathroom, knocked on the door, and said, "Tickets Please". An engineer stuck their only ticket under the door. The conductor took the ticket and left. A few minutes later, the engineers emerged from the bathroom. The math majors felt really stupid.

On the way back from the convention, the group of math majors had ONE ticket for their group. They started snickering at the engineers, who had NO tickets amongst them.

When the engineer lookout shouted, "Conductor coming!", all the engineers again piled into a bathroom. All of the math majors went into another bathroom. Then, before the conductor came on board, one of the engineers left the bathroom, knocked on the other bathroom, and said, "Ticket please."