Elvavrålet

Elvavrålet is a student tradition where students at universities and colleges at a certain time every night in student residential areas open their windows, go out onto balconies or rooftops and scream to relieve stress.
The roar is also called the Delphi roar, the Flogsta roar, the Lappkärr cry, the Ten cry, the Tuesday scream or Anxiety scream. The phenomenon has been known since the 1970s, and has been the subject of academic papers.
In the documentary Himmel över Flogsta, screened at the 2015 Gothenburg Film Festival, director Viktor Johansson chronicles the lives of students forced to live in Flogsta's gray skyscrapers for four years and scream in the night to vent their anxiety.