What exactly are we hearing in these YouTube videos posted by people who claim they've recorded ear-splitting roars coming from the sky with no explanation? Here you can see one of the latest, recorded in Budapest, Hungary last week. Conspiracy-lovers are calling them "apocalyptic sounds." Whatever they really are, they're freaking creepy. Are they jet engines attached to UFOs, bizarro weather, or pure fakery?

Here's a vid taken in December in Conklin, Alberta, Canada. I truly hope they're an ARG for an upcoming horror movie because I would watch the shit out of that.

Here's another one from December, taken in Tennessee, United States. Over the past few months, people have posted videos like this on YouTube from New Zealand, Sweden, Denmark, and Costa Rica, among other places. Find out more about the apocalyptic sounds from The Truth Behind the Scenes.