One of the "circuits" that springs into my mind is "harvesting free energy" using a wire wound on a 230v line. It can be enough to light a LED.

Or run it through a ferrite and make a secondary winding.
As it is inlined, not accross L and N, no energy is consumed and the obtained energy is free.

Bull. Of course the energy is not free and is taken, along with some loss, from the energy carried in the line. You have simply made a very poor transformer, nothing else.

 

Make a flying carpet with large MONO cells, and let it float just an hour before a thunderstorm.
Gigawatts! Only a few problems:

-How to know when there is a thunderstorm
-How to move the flying carpet base station + lift it very fast
-How to "extract" the electrons from the MONO cells

But for sure some genius will solve all these problems.

Easy solution -- just use the same technology that makes the carpet fly in the first place, namely magic.

 

Easy solution -- just use the same technology that makes the carpet fly in the first place, namely magic.

Funfair attraction - Electric whirlwind flying carpet. 50 people in 30m height on a metal cage carpet. It rotates too and exposes people to Multi G. Quite ridiculous and not premitted nowadays for a child.

I was scared i could be catapulted out of it.