Realistic knocking clips like this are widely used online as practical sound effects rather than as references to one famous source. Creators add them to short skits, horror edits, prank setups and fake interruption gags because the sound is instantly recognizable. On soundboards and meme pages, this type of effect stays popular because it is simple, versatile and easy to drop into almost any scene. It is closely related to other utility clips such as a door knocking sound effect and alert sounds used for quick scene changes.