Dendera light bulb and Baghdad battery.
Ancient alien theorists and others suggest, the carvings represent the possibility that ancient Egyptians used electric lighting to illuminate their tombs. There is evidence that shows some of the tunnels, inside the Pyramids, have low enough oxygen levels, fire cannot be sustained to keep the tunnels illuminated. Were the ancient people using electricity? Is it possible Aliens showed them this technology as well as the means to build the pyramids?
http://youtu.be/aYAkK-6aqoQ