UMs: The Paranormal Part 2

Again, we get to the weird end of the spectrum and delve into the (possibly) unprovable cases of the paranormal. So, be sure to set the correct tone with the right music and peruse the following:

William Willard Langston was witnessed by many in his home town after being confirmed dead in WWII:
https://www.reddit.com/r/UnresolvedMysteries/comments/n246fd/william_langston_was_declared_dead_on_iwo_jima/

In an incident eerily similar to Dytlov Pass, several teenagers go missing in the Siberian mountains in 1993 and are found dead shortly after, but no known cause of death exists:
https://www.reddit.com/r/UnresolvedMysteries/comments/izx1v3/in_the_summer_of_1993_six_hikers_died_in_the/

The Wow signal encountered in 1977 is still hotly debated if it is a sign of intelligence from outer space:
https://en.wikipedia.org/wiki/Wow!_signal

The Fresno Nightcrawler is something I would normally dismiss, but seems to be corroborated by multiple pieces of footage from multiple sources: 
https://www.reddit.com/r/UnresolvedMysteries/comments/30ajfe/looking_for_a_change_of_pace_lets_look_at_the/

The Mad Gasser: sinister anesthetic prowler, or mere hysteria from the 40s?
https://en.wikipedia.org/wiki/Mad_Gasser_of_Mattoon

200 miles east of Japan, 1984. There are a rash of sightings from airline pilots in the area of a bright flash, and one plane maneuvers to avoid it, but no explosion is recorded at all:
https://www.reddit.com/r/UnresolvedMysteries/comments/nexmzi/what_did_airline_pilots_see_off_the_coast_of/