I saw a hovering metal looking ball once, it was near the piramids of
Teotihuacan , perfectly round metal ball just sitting there, me and my mechanic thought it was a balloon, flew towards it and when we got close we saw that it was definately not a balloon (unless it had auto hover with the wind and all) we didn't even turn our heads and kept on flying,
Then on a night IFR practice flight for which I was riding passenger (in perfect VMC conditions, AS365) flying between Acapulco and Mexico City, me and 5 other pilots saw the sky in front of us light up with some lighted object that took up the whole windshield and it dissapeared upwards in about 4 seconds, it also showed on WX radar as a big red spot at about 5 miles.
I also saw a gasoline truck that had been hit by a train explode, a saw a French guy jump off a building to remove himself from society, I saw a DC3 make an emergency landing in the middle of the most populated city in the world without killing anyone,
And most recently I saw this (I am flying the blue helicopter)
The video is about 3.4 MB
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HERE