"What is the first name of the woman who cleans our school?"
Surely this was some kind of joke. John had seen the cleaning woman several times. She was tall, dark-haired and in her late 50's, but how in the heck would he know her name? John walked up to the professor, handed in his paper leaving the last question blank, then returned to his seat.
A few minutes later another student raised his hand and asked the professor if the last question was actually going to count toward the grade?
John never forgot that college pop quiz nor the lesson it hammered home. The next day John made a point to walk up to the cleaning lady and introduce himself. He learned her name was Dorothy and every day, from that day forward, he would say good morning to Dorothy as he entered his classroom.