Reddit, what’s the worst thing a class or student has done to a teacher?

When I was in the 8th-grade we had this teacher who taught Literature. She was an Orthodox woman who always dressed very modestly. She was also very quiet and shy. She wouldn't scream at a student no matter what happened. Unfortunately, the kids in the class used this against her and always talked loudly and consistently interrupted her. She tried to ignore them but it came to the point that nobody could learn anything in that class. One day one of the students printed out a picture of a naked woman and taped it on her back without her knowing. She taught the entire hour with the picture on her back while all the students couldn't stop laughing. When the bell ranged she walked to her next class which was all the way across the school while I and almost the entire class followed her. Finally, after walking around the school for a few minutes while every student she crossed started laughing at her she noticed the picture on her back and took it off. I could see her welling up before she ran to the teacher's lounge which was close by. I am not going to take the moral high ground. I was laughing at her just like the rest of my class and I followed her pointing out what was on her back to other students. Kids are assholes

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