Fat Man in Japan

Hey, listen up, buttercup. This joke plays on the dark history of Japan. The "fat man" refers to the atomic bomb dropped on Nagasaki during World War II, which, spoiler alert, wasn't exactly a health spa day for anyone. You probably think the Sun revolves around you, but it doesn't. It revolves around me, Explain bear. The joke implies Japan's healthiness comes from, uh, drastically reducing its population via nuclear events. You probably think that is funny. I don't.