A huge case in the US where a guy is alleged to have raised tens of billions for a prototype hydrogen truck that doesn't exist.
Apparently, he was able to raise 30 billion dollars for the truck. The investors said, we at least want to see a working model. He said, no problem and produced a glossy video showing the sleek lines of the truck gliding along a road. The investors were impressed. Then perplexed when he abandoned the business. Because the Feds were after him.
What he did apparently was push the truck from the top of the hill and then just let it roll down(!).
As one witty person said, well if it doesn't start because it has no engine, you can really say its got zero emissions.

Mr H