The average temperature in Japan.

The average temperature in Japan is 4000 degrees Celsius. About the hell joke about the average temperature in Japan, two art candidates said "World War II next year" after leaving the examination room, and then another student said "the highest daily average temperature in Japanese history is 4000 degrees Celsius". Hell jokes actually refer to jokes that make fun of other people's misfortunes, and refer to things that may not happen. Of course, 4000 degrees Celsius is also impossible and a joke.