Lego bricks are among the most recognisable toys in the world, and the sound of them clicking together is instantly associated with building, creativity and play. Short clips of that snap have circulated on soundboards and in short-form videos as a simple, generic style of building sound effect, rather than as a line from a film or show. Creators reuse it because it needs no explanation, it reads immediately as construction, and it fits the fast pace of edits, memes and toy content where a single second of sound can carry the joke or the transition.