5.1 Pennsylvania’s Duquesne University

At Pennsylvania’s Duquesne University, when a professor arrives more than ten minutes late, the class is canceled. One  day a professor made sure to arrive 15 minutes early for his 9 a.m. class.  He placed his hat on his desk and quickly ran over to the faculty room to greet the other professors. Before he knew it, it was already 9:10. By the time he got back to his classroom, it was empty. The next day, he really let his students have it. “When my hat is here,” he shouted, “it means that I’m here!” The following day, the professor arrived at 9 a.m. He was met by the sight of 28 hats on 28 desks — and no students.