Okay boys & goils, this is a pet peeve of mine. 1st, UFO does NOT stand for "Alien Spacecraft." It stands for "Unidentified Flying Object," which can be anything that flies but no one knows what it is yet. If you've identified a UFO as an "Alien Spacecraft," it is no longer a UFO, but rather, an IFO, an "Identified Flying Object." Don't believe me just ask the Air Force! ;)

