The domofon is the standard entry intercom found on apartment blocks across Russia and other post Soviet countries, used to call a flat and unlock the entrance door remotely. Short recordings of its buzzer have circulated on user soundboards as a recognisable everyday noise, separate from dramatic doorbells or phone ringtones. Online creators reuse it for jokes about visiting friends, waiting outside in the cold, and Soviet era housing, because the flat electronic tone instantly signals a specific place and routine without needing any dialogue or explanation.