Quote from Thunderdog:
UFO means unidentified. It doesn't necessarily mean spiritual, paranormal or any other such thing. Just unidentified.
Well, there's a reason I say "spiritual". Because often these objects do things that are physically impossible: travel at high speeds and turn instantaneous corners. Often there are legitimate sightings with "energy bursts" where trees/brush is flattened. So, for lack of a better term, I say "spiritual" because I mean it is not a physical space ship coming from another planet. Otherwise, by now, we would have some kind of physical evidence that some farmer in Uzbekhistan would have picked up...