Nobody shouts at me. Nobody has to shout at me to make me do something. If they ask nicely, politely and with respect and then I probably respond in a positive manner. I like to please people, I go out of my way to be helpful and I wouldn't deliberately disobey. My mum didn't shout at me as a child and I managed to grow up into a decent citizen knowing right from wrong.
So please don't shout at my children or anyone else's children, it's aggressive and bullying and will only serve a purpose momentarily. Read this. Or give up teaching.