A classic video for the nerd!

Hydrogen Production/Water Fuel Cell

Ok, before you are amazed by such videos as these:





or anything from here:

http://waterfuelcell.org/

make sure you check

http://en.wikipedia.org/wiki/Stanley_Meyer

Notice that Stanley Meyer's invention was deemed fraudulent by an Ohio court and that he was sued over trying to sell the invention.

Also, remember that there are no systems that can "produce" more energy than they consume.

It was just too good to be true!