I’ve referenced this opening skit to The Office in one of my Teaching Tips. Beyond being superb comedy, this is an interesting from a teaching standpoint.
At the end of a content module, no matter what domain knowledge or learning activities students were shepherded through, there has to be some sort of assessment, so both the instructor and the students know if learning objectives were met.
Hopefully, after explaining something in terms that a five year old would comprehend, your students will come away understanding the meaning of “surplus” rather than then fact that next summer, they’ll be six.