The newscaster at the end said it best, strange and everyone is wondering what the hell is going on. When I try to put myself into the shoes of the students in the class the worst case scenario is what happened. The reason is quite obvious. First day of school nothing is established. There is no forward momentum you're barely being introduced to the class. The new teacher is just as familiar as the insane dude. Why couldn't this teacher start doing this in the middle end of the semester. There is a sweet spot where a substitute teacher comes in and there is no direction moving forward so you coast and they let you pass the class. If you can't tell, I was so bad in college I used to dream of these scenarios. I just needed to pass my classes.