I am a teacher. These are my stories.
Usually, my classes consist of 12-15 mildly well-behaved children. There are a few exceptions to this (read: all of my fourth grade classes). But the behavior levels in class are directly related to the number of students in the class.
Imagine my surprise when I walked into a classroom of not 15 but 30 ten-year olds. Occasionally teachers will get sick and their students get shuffled to another teacher (usually whoever is working the same subject for that grade).
I had not prepared for 30 students. I think they could sense it because they were sitting on tables and throwing paper planes and about eight of them were wearing very obvious smirks. I took roll for my half of the class and prayed that nobody from the other half was missing.
Sixty eyeballs split into my forehead and I took a deep breath. Then it all unraveled.