recursion

Check out these alien abduction "investigations" from MNMUFON for a great example of what Jenny calls "Occam's Swiss Army Knife" -- where the most complicated explanation is mostly likely.

My favorite is the "Marcus" investigation, where a woman describes a cat-like humanoid being named "Marcus" who engadges in a "complete spiritual union" with her. Analysis: "I can not think of any objective natural or human made phenomena that would explain this encounter."

Uh, how about a bored housewife who hasn't had an orgasm in 20 years?