First off, why would you want to shout at a window at night in Sweden?
It's, like, WAY too cold there so that just doesn't make sense. In fact, none of this video makes sense.
Apparently, it's a Swedish tradition known as the Flogsta Scream. College students, every night at 10PM, will collectively scream out their windows.
Some say it's a stress relief, especially around exam times. Others say it's a creepy tradition for a student who committed suicide.
Whatever the reason, it's creepy. But also kind of heartwarming to know there's other weirdos like you out there.
But, mainly, creepy.