Once I worked at a private school (I taught 6th and 7th grade English) and the principal was a nun who stayed off of her much needed medication regularly. When she was on it, she was pleasant, kind, and she would talk to you. When she wasn't taking it, if you asked her a question, she would give you a dirty look or she would ignore you completely. She did this to teachers, students, and parents. It was the weirdest, most frustrating experience.