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A user called @finbilly08 posted the video yesterday on TikTok, where it's been viewed more than 600,000 times.
We see them standing outside and angling the camera up to the sky, pointing it to a large black ring that looks like it's made of smoke.
And apparently it's not the first time they've seen it, explaining in the video that it's the second time in a couple of months that they've clocked the bizarre phenomenon in the skies.
In the clip, they say: "Ittttt's baaaack!"
Laughing they continue: "This happened about, what, two-and-a-half months ago?"
Many people commented to ask what on Earth was going on, with some left wondering if it's 'a portal to another dimension' or even 'a portal from all the anime worlds coming to Earth'.
One asked, a little more sensibly: "Are those birds?"
But the general consensus seemed to be that it wasn't a flock of birds, but smoke, with some saying it may have been a 'transformer explosion' or a similar incident.
One person said: "It's a giant smoke ring, it's happened in the same location a few times, but no one has been able to locate exactly where it's coming from."
Another suggested: "It looked like a massive smoke ring. Either as some fun experiment or from burning the inside of a siloh to clean it."
A third agreed: "It's just a smoke ring. It happens during pyrotechnics when smoke is blasted through a circular pipe."
Similar black smoke rings often crop up, leaving people scratching their heads about what's going on.
After one appeared in the UK near Birkenshaw on the M62 a few years back, a UFO investigator ruled out any chance of extra-terrestrial action.
Nick Pope, who investigated UFOs and other mysteries for the Ministry of Defence in the past, explained at the time: "Despite exotic theories about UFOs, aliens, or portals to other dimensions, I believe there's a decidedly down-to-earth explanation here.
"A so-called smoke vortex can arise when you have a blast through a circular structure like a smokestack. So these weird effects can be caused by accident - or indeed by design.
"On this latter point, they can be created as a sort of pyrotechnic effect, and it would be interesting to know if there were any outdoor festivals being held in the area concerned.
"I realise that by debunking this I'll probably be accused of working for the Illuminati or something, but I genuinely think we can close the case file on this one."
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