I had a wonderful P.E. teacher in kindergarten. She left and was replaced by a loud, obnoxious, somehow overweight guy (Nothing against overweightness, but he was a friggin' P.E. teacher). I hated him. We warmed up to the same Shania Twain song every horrible time. And he was, again, obnoxious. (Turns out that he was finally fired a year ago for molesting a girl.)
I had a horrible 7th grade English teacher. She made us read "The Pearl," a 90-page book (a terrible one at that). And then we had a 36-page packet to do. Most of it wasn't related to English. Like coloring a full sheet of blank paper as if it were a postcard of where the book took place. And then as I was answering some of the worksheet questions about the book itself, and a question said the answer was on page 100-something. Note that the book is 90 pages. Turns out a few people got longer copies (114 pages), so I had to ask someone to let me borrow her copy.
But that teacher's main bit (other than her love of Elvis) was "Chances." You earned little slips of paper if you did well on a test or whatever. She occasionally held auctions. Most auctioned items were candy bars. There was an occasional homework pass, but not much worthwhile. I was quickly earning a lot of these things, and I wanted to save them for something special. So I waited. At the last auction, she offered a "No Essay" pass. I wanted it. I bid all of my Chances on it. I easily won. Everyone else had wasted theirs on chocolate (Not that chocolate is a waste, but if you're earning school-related stuff, then you might as well use them to help yourself out). I was thrilled. Finally--something I could use! She loved stupid essays, and I hated them. She didn't assign good topics and was mean about it. So when she assigned the next essay, I waited for her to come to my desk (so I wouldn't be flaunting my ticket in front of the class) and asked if I could use the pass on it. She said that I couldn't, because she felt I needed to do that one. I sighed and said okay. She assigned two essays after that, neither of which I was allowed to use my 2000-Chance essay pass on. If I had known she wasn't going to assign any after that, I would have fought more, and at the end of the school year, I left dejected and defeated. (She was asked to retire a few years ago. During a school year. Apparently she'd been doing some pretty crazy stuff that school year.)
I've seen a high school math teacher fart in a student's face. Intentionally.
In high school, I had to have an evil device put in my mouth to make my tongue stop pushing against my teeth. Well, it was too long and gave me a lisp while making holes in my tongue when I was trying to chew and talk (not necessarily at the same time). I had a teacher pick me to read something out loud in class just so they could all laugh at my lisp. Another teacher had me say something about my "grill" in a car full of boys. (The "tongue crib" was removed a couple of days later and replaced with something more suitable.)
My favorite of crazies is Mario. I don't know if any students ever remembered his actual name. I know I knew it at one point. But all that's remained is his creepiness and mustache. He was a substitute teacher. (He was eventually fired after getting caught with some drawings he had done of a partially naked female student.) He currently comes to the public library every day, and he's there way before it opens in the morning to use a specific computer. He looks up almost-naked women.
I have more I could say about Mario, but I think his creepiness stands for itself.