I swear my FACS teacher in high school had a severe undiagnosed personality disorder of some kind. The way she went from being the most downright polite, helpful and encouraging person ever to being a massive witch with a capital B who wanted nothing to do with anyone and had about as much patience as a cat waiting for dinner was truly incredible. There was no rhyme or reason to it at all. You always had to find out the hard way whether she was in "nice" mode or "pissy" mode. And sometimes she would switch personalities in the middle of the day. Not to mention, she was a big-time ableist and extremely prone to victim blaming, the latter of which thankfully got her fired after a truly horrific and misogynistic comment she made one day during health class resulted in nearly half the class walking out of the room in order to report her.