That was funny, though being cynically minded like I am, I cannot help thinking he coordinated this video with a bunch of friends or school buddies, that perhaps were standing on the ground beneath his building. Notice he never pans the camera to the street? Also it sounds like the screams are all coming from a general area as their volume seems fairly consistent. If it were more spread out and echoing off of the buildings, I think you would hear some really faint screaming, as well as some louder. Also, most of the screaming sounded like young, drunk people. LOL I didn't hear any mature voices in there... though, if I were to scream like that in response to someone else screaming (at any age... which I would most certainly do, LOL) I don't think that would qualify as mature.
PS - I thought you wanted to live in Sweden for the Swedish Bikini Team!
Also really cheap seafood lunch including lobster, great social healthcare, funding of community programs...apparently they pay for it all by agreeing to imprison the souls of the damned!