People have flying-related phobias for a number of reasons: Maybe they're worried the plane will malfunction or that they'll see something strange while they're up there. After all, plenty of pilots have reported seeing all sorts of weird things miles off the ground.
Frederick Valentich was one of these pilots - he radioed into traffic control midair one night to report seeing an object flying near him in the sky. His last words were, "It's not an aircraft," before being cut off by a metallic scraping sound, followed by radio silence. Valentich was never seen again.
What happened to him? We may never know for sure, but here's a full breakdown of the situation and some of the most likely theories surrounding the mystery.
Pilot Frederick Valentich Was Flying Over Australia When He Saw Strange Lights
What Valentich Described Sounded Nothing Like Another Plane
Valentich's Audio Cut Out, And He Was Never Heard From Again
Some Believe The Pilot's Disappearance Was Planned
Some Theorize Aliens Abducted Valentich
The Area In Which Valentich Disappeared Has A Bad Reputation