Here’s a clip that shows what happens when you lean out and scream from your window in some parts of Sweden. It’s a nice collective way to send a shiver up your spine and possibly annoy your neighbors, also it’s tradition.
The clip was posted to Reddit recently, but has been floating around for a bit now. Some of the comments pointed to a tradition that has stood since the 1970s called the Flogsta Scream and this Huffington Post article confirms it.
I hadn’t heard of it until today and the whole thing is just odd. I’m so used to a world where yelling out of my window will earn me the scorn of my neighbors. This is what I expect when I yell out of my window: