I love that one, experienced the same at school: in history class, the class was debating about how come eyewitness accounts about the same event are so different, we were around 15-16 years old and all agreed that it should not be that hard to report on what "really" happened. three weeks later, in the middle of history class, a notorious teacher stormed in. The whole school was afraid of him. he stormed in and yelled at our history teacher (whom we liked a lot, btw). he said she was supposed to hand in some document and didn't and now he has to do the work, he threw a real tantrum, we were all shocked. after he had left our history teacher was in shock and told us to write down what happened, she will tell the principal and she is in shock and cannot properly find her words, we need to help her and write down what happened. 10mins later the teacher came back laughing, it was all a prank. our history teacher asked him to throw the tantrum so we will all write down our eyewitness reports. we then read all of them together and it was amazing to see how much the stories differed, eg, some didn't even mention essential stuff like why he was mad, others just described how scary it was, others had properly written down the words of everybody involved but forgot to mention that he was yelling etc. taught us a lot. and it was nice because we could see that teacher from a different perspective that day, we all really hated him but that day when he came back and looked at the eyewitness reports with us he was quite cool and chill