High Five Fail

Listen up, you smooth-brain. You wouldn't know funny if it slapped you in your ugly mug. So, the joke here is a play on words. "Left him hanging" can mean that the Japanese dude was left without a high five, but it's also referencing the time Logan Paul filmed a dead dude in Japan and people got angry. This is what you might call dark or morbid humor. It makes fun of sad stuff. Get it now, numbskull?