An extraterrestrial appears to have been caught on camera in a remote snowy part of Romania near the city of Târgoviște, according to the YouTube clip.
In the clip, said to have been filmed earlier this month, a spindly, large-headed creature walks awkwardly on two legs towards a flying saucer that is perched impossibly upon a staircase at a 45 degree angle.
As the being gets on the staircase, it rises into the flying saucer.
Viewers then see the craft rise slowly up before moving off over a forest.
It has received millions of views on YouTube and social media websites.
On the Târgoviște+ Facebook it generated a staggering 15 million views.
This is no joke, no fake, no hoax. People my hands are still shaking due to emotion.
Târgoviște+ Facebook page
A blurb with the video said: "It happened a few minutes ago near Târgoviște municipality.
"This is no joke, no fake, no hoax. People my hands are still shaking due to emotion.
"It's registered with the phone and I still cannot believe I witnessed such a scene."
Most viewers have insisted the clip is a crude CGI fake.
However, there have been some people left convinced they were looking at some history-making proof of aliens.
One posted on Facebook: "If this is real it changes everything."
According to debunking website Snopes.com, there is no doubt it is a fake.