Missjean, your story of screaming kids takes me back to the last student teaching assignment I had. I knew a fire drill was coming, but something went off in my head when the alarm rang and a real nice little boy started to cry (1st grade). My mouth started to move and say things that offended and shocked my brain. The buzzer simply triggered something in the subconscious to get large and take charge. Honestly, I was ashamed of myself.
To this day, however, I startle at the sound of buzzers and loud bells.
It was that day I knew I was not a teacher of young children. I finished out the assignment, graduated and went into business for myself.