Yep-those ancient Egyptians had electric lights, airplanes, and batteries. They also had wireless power, because we cannot seem to find any wires. Oh, and they were able to move 20 ton stone blocks-must have had caterpiller tractors.
From H2’s America Unearthed, the claim is again at least as indeterminate in origin as any ancient alien.
I have a good friend, who unfortunately, believes this crap. 
You’ve all missed the critical element, here. A certified ancient aliens theorist must have “von” in his name. (Not recommended in Germany.)
(My very favorite von Daniken claim: there are carvings of skeletons in some cave or another. Without [alien] x-ray machines, how could ancient peoples possibly have known what skeletons looked like?)
I had an idea for a sci fi short story, alien astronauts are investigating a lifeless rock of a planet. Through clues it is revealed to be Earth in the far, far, billions of years past. The aliens conclude there is no life on this rock, and before they take off they empty the ships toilet system because they are low on fuel.
The origin of life on earth!
Clarke wrote a story wherein the fungal proto-life on Venus was destroyed by infection from the visiting humans’ garbage dump (including cigarette butts).
There was a Stanislaw Lem history where a couple of alien astronauts where on trial for doing just that, and the human character was brought to court as evidence.
- Learn the subject; or at least what passes for the subject
- Attend a lot of conventions and seminars
- Give entertaining talks on the subject and develop a following
- Do a couple “talking head” shots for either the History Channel or Discovery.
Congratulations! You are now an ancient astronaut theorist.