I used to have a teacher in highschool who would absolutely be high sometimes in class and he used to just get big bowls of popcorn for himself in the middle of class and stare out the window slowly eating it and rubbing his belly. Great teacher.
I love people with ADHD because they never actually forget anything. You just have to say the right words to activate them like a sleeper cell and then they awaken with all of the knowledge on a very niche subject they studied for 3 months straight 6 years ago.