What is the meaning of the story that Huo Simiao told Dr. Zheng in the 23rd episode of Mind? This is a joke. I don't understand. Is it a video clip?

It is said that a group of critically ill patients will die in a hospital at noon on Sunday 12, and this hospital will make a detailed investigation. Finally, it can't find a reason. These patients have different symptoms, different conditions and different medications, but every Sunday at noon 12, a group of critically ill patients will die in this hospital. It's amazing that the hospital began to spread rumors, and nurses and doctors thought it was haunted. Oh, my god, karma. Then this Sunday at noon 12, the cleaner came to the intensive care unit of the hospital as usual, unplugged the power supply of the intensive care unit, plugged in the vacuum cleaner and began to clean. The patients in the intensive care unit died because the machine that kept them alive died.