I remember being up front in a class in 5th grade for a spelling bee and laughing and jostling around with a buddy. The teacher was a rarity at that time (1970) in that he was male. He called us out of line and took a long ruler to our open palms. You'd be amazed just how much that can hurt

The worst part was that it was done in front of the whole class. Needless to say, I never got into that situation again.
These days there is simply no way to succeed as a teacher IF your aspiration is to actually TEACH children to prepare for a productive life in our society. The deck is so stacked against them that it's a stupid career path.