Kurt Cobain and his guitar are interrupted by a loud scream every few seconds. A moment follows a dull blow, then the clink of glass. What sounds like the background noise of a horror film is everyday at the Landstraßer Belt in the third district in Vienna: in the anger, an inconspicuous ground floor with darkened windows, people pay for people with a crowbar, hammer or baseball bat. Nirvana is part of the soundtrack. The anger is a business model.