What does the excavator joke mean?

There is no need to use nouns such as "collective unconsciousness" to describe generalization. To put it simply, it's just that some (I guess) A Zhai who surfed the Internet in the living room listened to the advertisement of excavator technical training on TV and repeatedly bombed it. Then when the first person shook the baggage with it, others also gathered together to play with it. It came and went like a gust of wind, and after a while, the baggage naturally disappeared. However, this technical school is also responsible for the publicity of network awareness, so it may also be promoted as an advertisement by this technical school. You know, as long as you can make a product famous among the public these days, you can make the boss take off his clothes and kneel down.

And this way of ending a long text with an unexpected turning point can be called "trap baggage", which is to let you fall into a fixed mindset and then completely deny your guess because of the turning point, so as to achieve the purpose of amusement.