I’ve always been impressed with the Lonnie Zamora case; and the Phoenix Lights. The Trumbull County, Ohio case was interesting, and the 911 audio used to be available in lots of sites online, but tonight I can only find the one below (you can buy it on Amazon, though):
https://en.wikipedia.org/wiki/Lonnie_Zamora_incident
https://en.wikipedia.org/wiki/Phoenix_Lights
https://www.youtube.com/watch?v=VXwG-kBYE6U
I would add the Cash-Landrum incident and the Illinois Triangle UFO Sighting.
(The Kelly-Hopkinsville ‘event’ is just for fun)