The term UFO
I had always thought that the term Unidentified Flying Object had come into use in the late 1940s or 1950s, but when recently watching a cartoon with my five-year-old daughter I seem to have found an earlier usage. In the 1942 cartoon
A Tale of Two Kitties (first appearance of Tweety Pie and featuring Abbot and Costello type cats) Tweety at one point puts on an air raid warden helmet and phones in to report an “Unidentified object flying awound my wittle head”. It seems that the UFO term originates from WW2 aircraft spotting.