Insane or Con Man
I sure felt conned into watching this movie. Not one scene struck me as laughable, but many scenes were absurd. My belief is this guy is intentionally over the top because every now and then, a sucker will come along and take the bait. Case in point, anyone who would pay this joker $5 to lecture, much less make him a top ten highest paid speaker in the world.
The filmmaker probably thinks he advanced his career by exploiting a mentally unstable egomaniac. I think it was the other way around.
A water powered bike for ~$200k USD that by the way, you have to pedal. A roller skate boot mounted on a remote control car. Nakamats was just too coherent when speaking of these wacky products. It's fraud if you know its a lie, so one has to pretend to believe.