On 30 Sep 2006 09:58:32 -0700, the following appeared in
sci.skeptic, posted by "Sir Arthur C.B.E. Wholeflaffers
A.S.A." <science@zzz.com>:

What is a UFO?--The definition!

It's an airborne object that hasn't been identified. That
*is* what the initials mean, y'know.

<snip>
-- 

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
                          - McNameless