English is not my native language so I apologize in advance for any mistakes. Oh boy I've got a good one, I had a bad short temper as a teenager and I was very stubborn. This happened in the 8th grade.

Near the final examination period, our school they normally gave every student a schedule paper for every final exam. For some reason the principal himself decided to distribute the papers, he came to our class right after a break and noticed not a lot of students were in class. He told me to go to the football (soccer) field and tell the students if they didn't come in class in 3 minutes they won't get a schedule paper and they would be punished, I did what he asked and came back to notice that I didn't have paper on my table, asked my friends and they told me the principal skipped my table and despite my friends reminding him he just ignored them and told them he didn't send anyone. If this happened to me today I would copy a paper and move on, but the 14 year old me was quite mad so I decided to barge in to his office and told what happened and politely asked for a schedule, he told me that I was lying, I got so angry that I called him loudly a son of a bitch and slammed the door behind even though he was shouting at me to come back.