The demonstration is often done in large physics lecture halls. A person is put into an metallic cage, and the cage is hit with lightning! (The high voltage, about 30,000 V, to do this is provided by a Van der Graaff generator, on the left side of the video clip). What happens?
Contrary to our naive expectations, the person inside the cage is not hurt by this procedure, even if he touches the metal right at the point where the sparks hit:
Tough guy? No, just a consequence of shielding and Gauss' Law.