Almost all my teachers (I was homeschooled until 10th grade, I didn't have that many teachers) did something weird. Never bad weird, but still weird.
My 10th grade lit teacher was pretty normal for the most part. Probably the weirdest thing she did was when the class clown said "Roses are red Violets are blue Vodka is cheaper Than a dinner for two" she responded with "Andrew... it depends what kind of vodka..."
My world history class was super easy thanks to the teacher. He would give us the test as homework (different format though), make sure everyone got the questions right, let us study for a week straight for the test, and gave us the test (with a word bank). I got 100 (sometimes more) on every single test in that class (I did get one 96, but I had a very good excuse). Somehow I was the only one to do that. Sometimes he would let me grade my classmate's tests. One time I forgot there was a test (we spent a long time on that chapter for some reason) so he gave me the answer sheet to study off of right before the test.
My Chemistry teacher used that period to vent. She told us about the middle schoolers she taught (K-12 school), how we were her favorite, how her daughter got mugged, how her nephew got killed, how much college is necessary, how her economics professor was a stoner, etc. She also let us do our own experiments instead of a midterm or a final. She allowed anything for that experiment. One of my friends made a fireball, one guy set his hand on fire, I'm pretty sure a few bombs were made, root beer was made, I made aluminum foil eat itself, etc.
My 11th grade history teacher was 99.9% normal. There was one time where we had to do a 10 page paper and we wouldn't shut up in class the day before it was due so she made it 12 pages. She said that if we were being quiet she would tell us later that day that we could only do 10. I was quiet, but she never told me not to do 12 pages so I did 12 pages, but I couldn't finish in time (it was my first huge research paper and I didn't know how to do citations). She said she wouldn't count off for turning it in late since she forgot to tell me to only do 10 pages
My U.S. history teacher couldn't teach. She was so bad. She didn't even know basic facts. She told us that Kennedy lived in Maine. She marked two answers wrong on my midterm that I obviously got right (Paul Revere was NOT a 23 year old shoe maker! Three sentences should have been enough for the essay after she said a few sentences!). She gave us homework that not even google could help with. She let a substitute teacher grade our speeches we had to do for homework (the only C I got in that class).
My Anatomy teacher was just a fun old lady. Didn't really do anything too weird, except doing gangnam style at a school dance and tried to start the harlem shake during lunch.
My Computer Applications teacher was awesome, but she did learn about juicing that year. We were then forced to do a powerpoint on the benefits of juicing. Then she brought in her juicer for everyone to try.
My P.E. teacher just made us run a few miles away from the school on the sidewalk and was totally fine with everyone talking during class (when it was raining, too cold, etc. she turned it into health class). Pencils were thrown, these three guys constantly talked about masturbation, those guys got one girl (one of the guy's sister) to try to touch her elbows behind her back, they flirted with the teacher, everyone insulted each other, people cursed, etc. This was a Christian school so that was chaos for us. The teacher didn't care at all.
My Personal Finance teacher was evil. She constantly yelled at us because we weren't doing our homework ("THIS IS AN ELECTIVE YOU WOULDN'T WANT TO FAIL AN ELECTIVE!"). I looked at my grades online one day and it was a 33. When she was yelling done yelling at us the next day, I mentioned that I had a 33 in the class even though I turned in every assignment on time. She responded with "Oh, that's just because you joined late" and refused to do anything about it. She also constantly forgot my name. The school has less than 200 people, it's not that hard to remember everyone's name. I dropped that class after the first semester since I couldn't stand her.