And then for every 15th wave, a teacher comes, every 35th, the gym teacher comes, and the boss fight is the principal. The secret boss you can get is the janitor, which is nearly impossible to beat, since he is so giga chad.
My friend: “How many second graders do you think you could beat up if they came at you in waves of 10 with a 5th grader boss coming every 5 waves?”; Me: “I think I could handle that”