2. The Nephilim
Much confusion surrounds the Nephilim, or ‘fallen ones,’ who pop up in Genesis and are described only as the offspring of ‘sons of god’ and ‘daughters of men.’ Some have interpreted this to mean the offspring of angels and human women. Another, less interesting explanation is that the passage refers to the mixing of two human tribes: ‘godly’ people descended from the good-guy Seth and the somewhat less godly descendants of bad-guy Cain. If that seems too dull, don’t worry: there’s also a strong Internet community that believes that the Nephilim were in fact extraterrestrials.
Pipped at the post by the Leviathan.