As an adult watching it I laughed because I remembered that awkward age and was probably just as awkward (also overweight!). I also definitely felt super sorry for that kid. "Haha! Oh man... That poor kid!"

It's funny to adults because we have a sense that kids are naive and do stupid stuff and it's hilarious ("Hah! Check out this silly kid..."). We laugh at our own young stupidity as well when reminiscing (well, I do anyway haha).

It wasn't until someone added the light saber effects to the video that I laughed really hard. Like, ROFLOLCOPTER levels of laughing hard. That was a whole new level of Internet funny I had never experienced before. When it reached that level of ridiculousness I remember thinking, "I hope this kid takes this in stride and understands the joy his silly video is bringing to the world and doesn't just get super depressed."

Unfortunately we all know now how it went 😢

His weight adds a lot to it I’m sure, but his general lack of grace or coordination is generally what makes it funny to people imo. Like it’s a hilariously bad impression of a lightsaber battle, so bad that I think most people assumed it was staged/self-aware. I think it could be a 60 year old woman or an 8 year old kid, it’d still be funny.