UFO phenomena is divided into six general categories. The first, “Nocturnal Lights,” is the one most commonly reported and the least strange of all. Most such reports are easily explained as heavenly bodies, meteors, etc. and are not considered UFOs. Truly puzzling Nocturnal Lights (those that remain unidentified), which seem to display intelligent action but are not explainable as ordinary aircraft, are often seen by multiple witnesses, including police officers, airplane pilots, and airport tower operator. The four fascinating cases are amongst the best ufo cases ever reported.