Is it raining in London today? What is this?

Is it raining in London today? This stem comes from Sun Xiaochuan.

In London, England, there is a tower called the Tower of London, which houses giant pandas. A netizen said, "The Tower of London has a switch. When you open it, there will be many lights in it. If it rains, you should pay attention, because there may be a short circuit. " This stalk means that people express their doubts about the accuracy of weather forecast in a very wonderful way.