When I was in primary school, there was a power outage at that time, and the bell was always ringing by hand. Several times in primary school, we were doing broadcast gymnastics.

Because they think such things are fun. I suggest you do your own thing first, and don't think too much about the past, so as not to increase your troubles and affect your normal life. Some people laugh low and it's easy to start laughing. Think about it. If everyone is doing broadcast gymnastics and the power goes out suddenly, there will be no sound on the radio, and some people will feel very suddenly. In this case, they will laugh. Wish you a happy life!