Going back to the lighter side, I was reminded of an interaction between a teacher and student at a graduation reception:
Professor: Congratulations, Ms. Jones.
Student: You remember me?
Student: But I was only in one of your classes. How did you remember me?
Professor: You sat in the front row and asked questions every class until about two weeks into the course, when you came up to me after class and asked, "Does attendance count." I answered "No" and never saw you again.