Hundreds of thousands of people have signed up to storm Area 51 and "see them aliens".
The Facebook event 'Storm Area 51, They Can't Stop All Of Us' has had 341,000 people say they're going, and another 362,000 considering it.
"We will all meet up at the Area 51 Alien Center tourist attraction and coordinate our entry," the page reads.
"If we naruto run, we can move faster than their bullets. Lets see them aliens."
The event is scheduled for September 20.
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No one outside of the US military really knows what goes on at Area 51, located in a remote part of Nevada. The best guess is experimental weapons testing but, since the 1980s, it's been rumoured to be the resting location of an alien spacecraft which allegedly crashed in 1947.
In hit 1990s movie Independence Day, this is certainly the case. But the official line is that the object which crashed near Roswell, New Mexico in 1947 was actually an experimental weather balloon.
The storming of Area 51 is almost certainly a joke - it's being hosted by a Facebook page called 'Shitposting cause im in shambles'. Shitposting, according to dictionary.com, is the act of posting" off-topic, false, or offensive contributions to an online forum with the intent to derail the discussion or provoke other participants".
A 'Naruto' run is to run really fast with your arms behind your back, named after an anime cartoon character who does exactly this.
There have been more than 17,000 posts made on the event's Facebook page. One suggested a possible plan of attack, while another said they're planning on rolling up in a car and leaving in a UFO.