An alien introduced the concept of gods as a practical joke on humanity just before the first Egyptian city was created. It's been ROTFL for thousands of years.
"Teasers are usually rich kids with nothing to do. They cruise around looking for planets that haven't made interstellar contact yet and buzz them, meaning that they find some isolated spot with very few people around, then land right by some poor unsuspecting soul whom no one's going to believe and then strut up and down in front of him wearing silly antennas on their head and making beep beep noises. "
Ford Prefect, Hitch hikers guide to the Galaxy vol 1 (Douglas Adams)
Love Adams. He enlightened me on the relevance of the number 42.