Infinite energy?

There is a virus video that are making crazy my students. 
"How can be possible?" They asked.
I told them that can not be. How he did that? Easy, when he puts the lamp we can't see the extension. That means that is connect to elsewhere.


Here is the video:

And here is how my facebook's friend Iberê made the same experiment and the explanation:

Remember one of Physics laws: Energy can not be created or destroyed. Energy transforms one to another types.