The young people are getting more and more fussy. There used to be flash mobs, and now there are still mobs. Look at this video. 207 people in New York's Grand Central Station were frozen for 10 minutes (similar to when we were kids and heard the national anthem, then we would put down everything). Look at the expressions of other ordinary people. Now there are a lot of people doing this thing in China, and it's more fun with more people. In the video, they won everyone's applause. I guess if it happened in China, they might "win" the title of "a group of crazy people". Anyway, it's fun!