Dr. Jekyll: Dammit all Hyde, I hate this time of year.
Prof. Hyde: Are you dreading the onset of winter?
Dr. Jekyll: No. My vexation is that daylight savings time has ended.
Prof. Hyde: I am not sure I understand.
Dr. Jekyll: In this northern clime, that means it now gets dark before all the students have left the building. You know how I don't turn on my office light so that people think I'm not there?
Prof. Hyde: Yes, but...
Dr. Jekyll: Well, now I am forced to turn on an office light to get any work done. At least I may have discovered one thing about students that perhaps Nature will be interested in.
Prof. Hyde: Which is?
Dr. Jekyll: Students are more like moths than roaches regarding the light from faculty offices.