When revealing this past weekly set of bonuses in Grand Theft Auto Online, Rockstar Games dropped the first hints for this year's Halloween Surprise update. The annual celebration of "spooktober" as it's become known among netizens always has some kind of theme, and it seems this year it's aliens.
The initial tease consisted of a newspaper headline indicating that UFO sightings in Blaine County and Los Santos have increased ahead of Halloween. True enough, ever since this announcement went out, players have begun reporting the appearance of flying saucers.
Specifically, these UFOs would appear each day between the in-game times of 10:00 PM and 3:00 AM. One flying saucer would appear over a specific location and simply hover there until the time was up. Seemingly, it is impossible to coax any kind of interaction out of them.
These flying saucers can't be damaged by anything — no matter what kind of weapon you shoot them with, it will have zero effect. Granted, nobody has tried punching them yet, as it is impossible to get near — they automatically disable all vehicles in close proximity, and by hovering so high above ground you could only possible get on board with some kind of aircraft.
We wonder what would happen if someone approached vertically from above, so even upon having their vehicle disabled they'd fall on top of it — but no such attempt has yet been documented by the community.

If you want to take a swing at fiddling with the alien visitors, here are the UFO sighting locations: