What is a cold joke? Who can make a metaphor and how to explain it? Who can explain it in detail? Thank you.

I don't need profound knowledge to explain it to you. The first two people's explanations are profound but not very detailed. I tell you with my understanding:

The so-called cold joke is that people are not amused but shocked after listening to it. For example, I will tell you a simple story: fudge was walking on the road and suddenly sat on a bench by the side of the road and said, I'm exhausted and my legs are weak. You may have heard of it. After listening to this story, do you feel shocking and speechless, but it's not funny at all? Another example: Kirin went to the North Pole and turned into ice cream. It seems impossible. I have a rich imagination and feel a little funny, but I can't laugh. I just feel that the thunder has arrived and I am speechless.

I hope my answer will make you understand, thank you.