I got slapped by my teacher infront of everyone for pointing and showing with my left hand, that the answer I have written on the answer sheet is correct and I should get the marks. Then he lectured me for ten minutes about not using my left hand ever again in his presence. Flamed my parents that they should have taught me that and are bad at parenting. He finally gave me full marks, but I cried the whole day and got humiliated infront of whole class. This happened in 2000s