Strange things
I have seen St. Elmos fire, falling stars, northern lights, illusions from temperature inversions, cloud to cloud lightning, cloud to ground lightning, landslides from earthquakes, rings around the sun and moon, steam from volcanos, caribou migration, pods of whales, schools of herring and I once saw a Chinese airliner taxi into a Russian airliner. That was pretty strange 'cause he just added more power...
...but I have never seen a UFO or a Chemtrail or any evidence of Saskwatch or Elvis.
There is some pretty weird flight testing out at Mojave and China Lake however.
Happy hunting.