Unidentified Flying Object
'Saucer' Clouds - Lenticular clouds (Altocumulus lenticularis) are stationary lens-shaped clouds that form at high altitudes, normally aligned perpendicular to the wind direction. Lenticular clouds can be separated into altocumulus standing lenticularis (ACSL), stratocumulus standing lenticular (SCSL), and cirrocumulus standing lenticular (CCSL). Due to their shape, they have been offered as an explanation for some Unidentified Flying Object (UFO) sightings. (Wikipedia)
Los Angeles, 1942: Just three months after the Japanese attack on Pearl Harbor, this incident occurred between February 24th and 25th, when an unidentified flying object was spotted over Los Angeles. Assumed to be another air strike from Japan, the UFO sparked a massive anti-aircraft military attack. The the true identity of the object is still unknown today.