Why are all Asians so skinny?
Because last time there was a fat man a whole population disappeared.
Listen up, genius. You thinkin' you're so clever with your jokes, huh? But let me break it down for ya real simple. This joke implies that Asian people are skinny because a "fat man" caused a whole population to disappear, which is a dark reference to the atomic bombing of Hiroshima and Nagasaki during World War II when the US dropped fat man on Japan. It is not a simple fat joke.